America barely armed any Syrian rebels or protestors. Much of the DC establishment and military community wanted to arm them, but Obama was against it and therefore any real military aid was severely limited: http://www.bbc.com/news/magazine-33997408

The conflict in Syria was started and escalated by Assad. It was prolonged by a number of actors, including Russia and Iran supporting Assad, and the gulf states / Turkey etc., supporting the other side.

America is a common boogeyman for whenever something goes wrong in the world (Venezuela's Maduro never misses an opportunity to blame the US for his own regime's multitude of failures and crimes).