Who look down on causal gamers. Who generally disdain the act of playing for some sort of Platonic ideal of a "serious" video game remind me far too much of the people I deal with in academia who think the Lord of the Rings is trash because it doesn't deal with "real" issues.
The thing is, I also dislike people who demand video games be entirely serious all the time.
I think Fallout should be silly and over-the-top whacky, however I do not by extension think that shooting should be a priority.
If your love of Fallout can soley be brought down to enjoying the violence of it, that shows a complete lack of understanding on what the series is trying to do. It is supposed to be a Roleplaying game that allows you to play whatever type of character you want, a simulation designed to make your choices feel like they have realistic consequences, a game that allows you to choose how you solve problems based on your character's personal skills. It shouldn't be the kind of game which encourages you to shoot randomly in all directions, and not even think of another way round it, or question who your shooting.
If you think Mothership Zeta is about the aliens, I do question whether you paid attention to the DLC at all. The point of Mothership Zeta is that humanity in all its infinite variations: Soldier, Slaver, Child, Cowboy, Samurai, and Wastelander can all join together to fight against impossible odds if they are willing to put aside their differences. The problem is that this existential threat is something which is required since they would never join together otherwise. Even so, the story is about humanity's capacity for peace and the strange little family they create as a result.
If you think this is what Mothership Zeta is about, you are reading too much between the lines.
Bethesda's idea about Mothership Zeta was that it would be cool to put the Lone Wanderer on a spaceship with a bunch of aliens. They then figured "Who else do you reckon has been abducted" and chose a Samurai, a Cowboy because everyone loves Samurais and Cowboys, a pre-war soldier and child because they are under the impression that Fallout should obsessively fawn over the pre-war world, and some wasteland slaver because they needed someone to introduce the LW to the story.
Even in the unlikely scenario that they were trying to get across a message of humanity working together and being able to have a capacity for peace, that doesn't make the DLC at all intellectual or philosophical in any way/shape/form, instead that would mean that they are copying the same cliched, overly-optimistic, not-fully-thought-out message that every piece of media ever written has had.
If you think the NCR was founded on people agreeing with each other all the time your badly mistaken.
The NCR had to drive out the remnants of the Khans and other raiders, who later tried to take vengence, the Brotherhood of Steel had always been at odds with being part of the NCR to the degree that they wanted to break away, corrupt cattle barons have always wanted to secure a powerful seat in NCR politics, ect.
The NCR was never about people working toghether to overcome harsh times, it was always about people tolerating each other enough to band toghether to make a nation that works in there interests.