You are putting a whole lot of words in my mouth or thoughts in my head. I have specifically followed the Disboards policies of not stating my political opinion.
A hero is someone who shows great courage while acting on noble principles. Someone who shows courage while robbing someone, for example, is not a hero at all. Whether or not Chris Kyle is a hero to you depends on whether or not you think that the principles he was acting on are noble, or misguided. Some people believe that the U.S. involvement in the Middle East is noble, and others believe that it's misguided. Both beliefs are political beliefs.
Regardless of whether or not I think that Chris Kyle is a hero, I think that announcing that political discussions are forbidden, while in the same post expressing a political opinion is unfair. I also think that the notion that someone's death is "unspeakable" is ridiculous. Regardless of what one things of Chris Kyle's career before this tragedy, I think there are good reasons to look carefully at what happened, in hopes of preventing future deaths. Refusing to speak of it means refusing to learn from what happened.