I was aware that many (if not most) people on the right were not aware that BOTH of the people who tried to assassinate Trump during his campaign were right wingers... but I've discovered that the assumption that these attacks came "from the left" or "from Democrats" is also common among people who are less politically engaged.
When I pointed this out I got an interesting response:
"Are you saying it was a false flag?"
"No." I responded.