Thankfully Assad can be toppled without "going to war". It's rather amusing to see how the left are trying to push Trump into a corner where they can justify calling him a hawk, foolish.

"Is toppling Assad worth war for US", I think that same question was asked regarding Hitler. If you have the capabilities to aid and assist the distressed you have a moral obligation to do so. However, if you can convince yourself that morals are just relative, then I guess you can just sit on the sidelines and hypothesize about the situation.