A guy who didn't pick after his dog on your lawn is "not a great guy". Asad is a brutal dictator who already caused death of thousands of people and will cause many more. He's way beyond "not a great guy". He's yes "so bad".
> One cannot discount the government of a country just so easily.
It's not "so" easily. It's a brutal strongman that uses WMD against people he's supposedly representing. It's not just some disagreement on taxes or policies. It's routinely using the military against people. And if you think ISIS is the only organization that opposes Asad, you are woefully misinformed - opposition to Asad is much wider and ISIS just used the chaos to get a stronghold, they did not initiate the civil war. And of course Asad has absolutely no problem with "extremist
terrorist forces" - as long as they threaten not him but say US or Israel.
> Incidentally the US has supported far worse dictatorships
Not "far" worse, as it's not very easy to go far worse than Asad (maybe Idi Amin who was rumored to literally eat people? Or Papa Doc Duvalier, who at one time ordered to have all black dogs in a country killed because he thought his fugitive opponent turned himself into one?). But yes, it did. But doing a bad thing once is not a reason to do it ten times more.