Trust me, by BEING there you already are noticed. This is something that has happened to me before. They KNOW you don't belong there, pretty much right away. They know by your clothes, they know by the way you look at street signs, they know by the speed at which you walk. The important thing in those situations is not to look like a fucking mark.
I thought we're talking about people living in those places. I mean if you have grown up in the favela of Rio then you do kinda 'belong' to it, which means you're most probably poor as fuck, know the gangs and that you shouldn't mess with them. I am not an expert here, I just don't see how guns are going to make you more secure in such cases or improving your live in any meaningfull way.
I'm not suggesting you go picking a fight where there isn't one (situational awareness is key) but if it becomes clear that you're not going to get out of the situation without a potentially deadly confrontation, are you really going to roll the dice without at least putting the odds a little more in your favor?
Which of course is very easy to decide when you get in a real emergency, things happen usually very fast and you don't have much room to make clear decisions. But I wasn't talking about picking a fight, just a situation of self defence where it happend that you shoot a gang member because he wannted to mug you, you mentioned MS13, they are not known for beeing easily scared. It could very well happen that you're now fighting the whole gang who are out there looking for revenge.
This seems like a gross oversimplification and excuse-making. Maybe if the Maras or Peckerwoods or Bloods had to worry about John Q. Public offering credible resistance every time they pushed they wouldn't have a stranglehold in the first place. Maybe if the folks there put their heads together and formed a Neighborhood Watch and cooperated fully with police (this last part is such a huge problem - it's basically a Prisoner's Dilemma). Etc. But this isn't about a person who RESIDES in the affected neighborhood, remember - it's about someone who stumbles into that neighborhood and wants to get out with all their limbs attached.
You also assume that armed civilians would be up to the task of fighting gang crime - or any crime in general. This might be true give everyone a weapon and crime will drop, I don't know it, but when I am thinking about the average civilian out there, I have serious doubts about it. Even battle hardened veterans and cops with years of experience under their belt, make mistakes, get sometimes in panick etc. The average person out there is neither physically nor mentaly up to the task in my opinion. Hell just look at the number of police officers that wrongfully shoot someone, because they thought it was a criminal or because they feared for their live panicking and shooting the person, and police officers are supposed to be trained for such cases. It seems much more likely to me, people would be even more panicking than they already do showing even more paranoia, because now they would have to assume that EVERYONE was armed.
You might actually just end up not only with gang viollence, but a situation where gangs fight with the 'neighborhood watch' in the streets, which is how some gang wars actually started where some people saw the need to defend them selfs. We're talking mostly about social and economic issues here so any solution to the problem has to start there, improving the infrastructure, creating job oportunities, better education, less corrupt intstitutions and so on. Why is Switzerland such a gun paradise with low crime (compard to the US)? because they have very great social institutions and a high standard of living.
I believe anyway that we have to radically change our stance on crime and violence in general. Harder punishment and more force by the police seem not to achieve the desired results and can make the situation even worse - see the War on Drugs. If you're looking at places like Compton or Ferguson the police is often see as enemy and there is a huge distrust between the civilian population and police officers who fear for their own lives each time they set foot in those areas. Maybe it's time for a different approach. Like giving people actually money:
This Once Dangerous California City Gives Young Men Money, All-Expense-Paid Trips in Exchange for Not Shooting
http://www.nma-fallout.com/threads/gun-control.206541/page-103#post-4288403
I am not saying it will fix ALL issues or that it's a perfect solution, but there is more and more resarch and experiments pilling up which tell us that we actually can indeed fight poverty, crimes etc. by just giving people money. And it might even be cheaper as well compared to what has been done so far.
A village in Kenya is quietly disproving the biggest myth about basic income
https://www.businessinsider.de/keny...est-myth-about-basic-income-2017-12?r=US&IR=T
Of course you need to train with your gun in order for it to matter. I never implied anything different. I encourage any and all gun owners to do just that. As for escalation, knowing when to escalate and when not to is something else you learn. And as for "the correct way to deal with such areas" - the correct way to deal with such areas is to not put yourself into those areas in the first place, but people aren't perfect, they make mistakes. There are going to be stupid gun owners that do stupid shit just like there are stupid drivers that do stupid shit. We don't go around confiscating people's cars because of joyriding teenagers and drunk drivers. We shouldn't go around demanding people's guns because of criminals and mallninjas.
Unless you make it a requirement you will have a lot of untrained people I am afraid. As I said, look even at TRAINED personel, like police officers and soldiers, and they make still plenty of mistakes. And while you're right, we don't confiscate cars, society has some very tight rules and regulations around cars. I would actually support it a lot if weapons would be treated like cars in the United States, where you're required to have a licence, proper training and driving experience before you can own and drive a car, with traffic laws people have to knwo and follow, where you could loose your licence and car if you're drunk, or mentaly ill etc.
In all honesty I think you're actually right! Treating weapons like cars would be a huge improvement for the nation.