Abuse is abuse no matter how you look at it.
The murders were symptomatic of the peer pressure and rejection this kid received. It doesn't matter what minority you are, what demographic you're part of. If you're bullied day in and day out, that's enough to make anyone snap. It becomes exacerbated if the parents don't support/love you. Working in the mental health field, mental health is a very real thing.
Facts may not care about feelings, that's true. However, humans have feelings, and they care about facts. As a species, we thrive when we work together, not when we fight each other. People trying to destroy PC culture, being polite and respectful is a detriment to our society. You shouldn't suspend the facts from people, but you should exercise tact. We practice it to some degree somewhere. We should practice it everywhere - that's human decency.