Trump is responsible for a lot of the hatred that is occurring in the country right now. A lot of the hate crimes that are going against immigrants Muslims, Sikhs can be directly attributed to Trump and the things that he has said when you go and you do the research on attackers or in this case suspects, a lot of support Trump or they believe it's okay to do this because Trump says its okay now I don't know whether or not he is racist or xenophobic I could give him the benefit of the doubt and say he isn't but he is stoking the flames and by extension that makes him a racist / xenophobe.
TRUMP isn't the one who decided to start cutting off people's heads or knock down the Twin Towers.