Oh, please stop. This kind of event is the result of continual marginalization of a group of people over a prolonged period.
You want poisonous? How about the relentless drumbeat of how conservatives want to destroy the planet, starve children, kill old people, want to reinstitute slavery, hate certain groups. That their candidates are nazis and KKK. It cones directly from the leadership on a national platform and it is a relentless continual assault.
Look at the posts earlier in this thread where a certain poster was putting forth as fact that if you support Trump that you can't be Christian. That's a perfect example of the outcome of this kind of horrendous philosophy. It's all done for political purpose and is part of a game plan that the far left follows zealously. This is Alinski's Rules for Radicals in action - demonize, marginalize, and dismiss. There is no room for debate.
Well, when you constantly feed your base the notion that one side's political views are evil, you are going to get buy in. And when people believe that others don't just have a different philosophy and viewpoint, but rather that they are nonhuman embodiments of evil, you are going to get some of those unbalanced believers acting out violently because they believe they have a moral right and duty to do so.
This has been a culture carefully cultivated by the far left. They didn't create the violent actors, but they did create the atmosphere and ideology where hate of others who think differently is okay because it is moral and ethical. That provides the impetus and atmosphere for some to act out violently in what they believe to be rightful actions.
Until the left owns and then rejects this kind of hate filled debasing of others with different views, this is going to be the result.