Ok, I lied. He wasn't drafted. He was a Navy Seal. A master in small arms and hand-to-hand combat, able to disarm or kill in a heartbeat. The people he killed probably weren't because of life or death situations (did a little more research on the subject).
But calling him an asshole for it, is pretty ignorant. And just because he killed some people, doesn't mean that he didn't feel remorse for it. After the war Mr. Rogers became an ordained Presbyterian minister and therefore a pacifist. Vowing to never harm another human and also dedicating the rest of his life to trying to help lead children on the right path in life.
I assume you've never seen Mr. Roger's Neighborhood. Was a good show, that lasted for nearly 30 years, I believe. It's a shame he passed away not too long ago.