Is there any information regarding why chemical weapons were used?
I'm more interested about official stance, than conspiracy theories.
These are possibilities I could come up with (assuming Assad ordered the attack) - without making up conspiracy theories myself:
1 - He figured it would send a message to opposition (rebels and their supporters on the ground) that they cannot win
2 - take out very important target (perhaps they took out important leader of rebels or such)
3 - perhaps rebels (or their supporters) did something unethical (in Assad's view), and escalated the war
But these are wild guesses, is there any actual reason that is being offered to us?