I don’t think it’s fair to pin this type of stuff on someone. There is a great chance that if Trump weren’t around, then the shooter would have clung to some other inspiration for his delusion.
So when people talk about how dangerous Trump's incendiary and violent words are when describing the border crisis, what do you think they're talking about?
We have a President who refers to incoming migrants as an invasion; who warns that they are rapists, and murderers, and gang members. And what's more we have a government that's not willing to do anything about it! Small wonder that some might look at that as a call to arms.
I'm not saying every time someone goes on a shooting rampage Trump is to blame. But it would be disingenuous to ignore his role in a massacre at the border by a shooter whose sentiments certainly match Trump's, and who allegedly published a manifesto echoing his own language. Come on.
Even Trump seems to recognize there's something to it, otherwise he wouldn't have frantically deleted all his tweets where he refers to the Mexican "invasion" in the wake of the shooting.