OK you've proved either side is capable of mayhem now its a matter of scale and your side has us beat hands down.
A little analogy is in order here. We used to tease my mom for driving slow and excessively careful. Her response was, she had never been in an accident her whole life. And the natural response to that was "That may be true Mom, but how many did you cause".
So, I will get to my point.
My perspective and opinion is that Patrick Crusius was a bullied and ostracized kid that withdrew into his own darkened world view. And that the political contention, with regard to illegal immigration and related racism, sent him over the edge. In essence, those that opposed his views, were also calling him a racist, on top of all the other personal attacks he suffered by his peers while growing up and attending school. It just got too much for him and he went off. Having that opinion is opposite of the "Trump is responsible" view that is being promoted. In fact, it is the liberals rhetoric about him being a racist and that final indignity and attack on him (taken personally) that caused Patrick Crusius to finally say "Fuck It!! I'll show them just how bad I am".
In other words, Patrick Crusius did not do what he did because he agreed with any perceived view Trump may have had, but because he was being denigrated, one more time, by liberal political rhetoric, for his own personal views. That is as likely a motivation for someone that has been ostracized and bullied, for most of his life, as the one which has him taking up a more violent approach, because he agreed with Trump's supposed call to him to kill Mexicans.
Just one more example of how political rhetoric can set off people living on the edge. Labeling people as bigots, racists, Nazis or degenerates can have its own negative impact. Especially those already on the edge.
Think about it. If someone calls you any one of those things, does it not flare a bit of anger within you? Some people can control that anger or push back with words. Others, that have been made unstable from their own life experiences, such as being made fun of and bullied for years, while growing up, may lose that ability, somewhere along the road.
Something to think about.