I don’t know the motivations of people who parrot Hillary and the Deep State. I suspect some of it is guilt for being on the wrong side during the Cold War (remember, it wasn’t Democrats who thought Reagan was an idiot, risking a war but re-arming the US) - so they want to come across as tough guys now, standing up to Russia, etc.
For others, simply ignorance...they’re too lazy to do their own research.
If you haven’t seen this yet, watch it - and keep in mind the reporter works for PBS, he didn’t set out to provide propaganda for Assad, not at all (lucky for the Deep State this video didn’t go viral):
https://www.pbs.org/wgbh/frontline/film/inside-assads-syria/
Thx for the link.
It could be something as simple as they have a financial or other stake in interventionism. What I found disturbing was the willingness to malign others.