Are ISIS an abomination?
Yes, everyone agrees on that.
Will bombing Syria solve the problem of ISIS?
Not clear - the evidence says no if you look at Iraq, Afghanistan, Libya, Yemen etc.
I would rather a genuine effort is made to discover where the funding, training, logistics, etc come from and deal with it that way. Oh wait, the Russians have been attacking the ISIS oil trade in the last few weeks, a trade the US managed to do nothing about. for the last year plus.
So who does fund / train / support ISIS... Hmmm. Problem. We would put sanctions and bomb Saudi Arabia, Qatar, Turkey etc who are our allies....
Overall I think the plan has always been to get rid of Assad and b****r the consequences (see Libya, Iraq, etc). None of our past actions have meant the people of said country have a better life and instead we have obliterated and semblance of normal life. Why should anything change now? I would be very pleasantly surprised if it turned out differently this time.