They write these manifestos in many cases for the express purpose of getting all sides to blame each other. He hardly appeared to be a big Trump fan, and he said his beliefs were in place prior to Trump. Ya, hes not real keen on illegals but hes also an eco kook and hates corporations.
Most of these people are lunatics who get a thrill writing about what they believe in and whats important to them in some sort of manifesto. We have plenty of sickos and its a rather diverse field which should please the left. They should all be shot on site when they get out of line.
The Dayton shooter was a Democrat, but im sure he had some political beliefs Republicans could oppose too. I dont care what he thinks about anything, or what any of them in the future think, its a good thing hes dead and his fellow lunatic in Texas should soon be joining him.