Well, there are the stock answers: Racism, Homophobia, Islamaphobia, America,Guns.
It is always the fault of America, some way or another.
He did not have his Al Queda membership card in his wallet, so it cannot be an act of terrorism or sudden Jihad syndrome...
I should add a /s to the above.
For those whose sarcasm detectors are set on “low”.
I heard that last answer from a liberal neighbor yesterday - this knife attack is proof that we need "common sense" gun control. All liberals are either stupid or evil, and there is a lot of overlap between the two groups.