Leftists, liberals, MSM reporters, whomever, will never take responsibility. It will take citizens with tar and feathers to convince the above to the error of their ways.
Famously espousing criminal behavior, especially the killing of the President, is a crime. If this leads to homicide by a devotee there are grounds for conspiracy charges. Such charges need to be filed. Threats of killing the President cannot be tolerated. How about we leak THAT investigation.