This attack had several possible purposes:
Now that there are no chemical weapons facilities in Syria, the US can pull out and let Russia do gods work. Chemical weapons were a red line, now they can't be made. Mission accomplished.
It allowed the US to look strong in preparation of the Iranian negotiations and makes NK's decision look justified since he will come out far better off than if he had gone to guns. This is important in future negotiations.
It probably blew the cover of several clandestine cells operating in Syria in including operations run by noname illegally.
The mockingbird media is now so confused, they don't know what lies to sell. War in Syria is GOOD! No wait, it is illegal!! More people will stop listening and start thinking.
All over, people are starting to talk about false flags. This is a massive shift in consciousness. Once you start to think, you can never go back to being a 'consumer' of media.
Trust the plan! The operation is very complex. This is psyops and direct action globally against a global threat. Don't expect to have the whole picture. If you can figure out the plan, so can the opfor.