So the US government declared him a savage animal and wanted to overthrow him. The problem? Russia was Assad's ally. And they refused to allow that to happen. They have deep ties with Assad. As well as naval bases in Syria. So that resulted in a proxy war. The US aiding, arming, and training savage barbaric monsters aka Isis, aka Islamic barbarians to fight for them to take over Syria. And the Russians, who actually are on the right side, who are supporting Assad and fighting these monsters.
This is all about energy folks. Natural gas and Russia's strangle hold on europes nat gas supply.
When you understand this, the level of barbarism the US is engaging in puts the fedgov in a whole new level of depravity in most people's eyes.