All year long the Left has been fostering a climate of hate, from college professors asking that Republicans be “lined up and shot,” antifa rioters, BLM demonstrators chanting “pigs in a blanket, fry them like bacon,” to Kathy Griffin jihadist photo-ops, while fake blood pours as Shakespeare in the Park stabs Donald Trump.
Read my post, A shootout in Alexandria.
[UPDATE: Doug Ross graphically illustrates the mainstreaming of political violence by Democrat extremists]
The danger is that the left actually thinks this is OK because they are right and anybody who disagrees with them should die. You also have to throw in the violent millennial snowflake tantrum crowd. This is the Saul Alinski effect.