If the US and partners were so concerned about a chemical weapon attack and its effect on the civilian population, did it really make sense to bomb the sites where these weapons are supposedly manufactured and stored? Would this not be taking the chance of releasing the chemicals into the environment and thus doing more harm than good?

And why did this not happen? Surely there would have been damaged stockpiles with the amount of munitions hitting the sites. And yet, nothing. No gas, no chemical trails, no poisons released into the air.
Are we that good, that precise? Did we totally vaporize everything existing there?
Or was there nothing in those sites to begin with?
I know which scenario I think more likely, how about your thoughts?