Considering Kyle killed people, at a very contentious and politically sensitive time, its understandable that the story was banned.

I've heard some very bad hot takes that basically amount to "he should have killed those people". Advocating for killing people is way less controversial than whatever "nuance" people want to assign to the case regarding legal standing of guns and various self defense laws.

Its not crazy to imagine someone thinking to just ban that whole discourse from a platform, even if takes some "genuine" and not-murderous conversations with it - simply to avoid people advocating death.