He has been a contributing factor because of his campaign of hatred against those different from him. The Wall, racism , bigotry, etc.

And it is idiotic to predict more lone wolf attacks and just say "I was right". These will be happening again no matter what that jackass Donald Trump says. And it is intelligence provided by the very people Trump insults repeatedly that could stop these. You need spies who look like the people we are trying to stop. Not hatred directed by a selfish narcissistic con man at these very communities.