You think Assad thinks like you do? His father killed 20,000 people in Hama back in the 1980's like you or I would swat a mosquito. I'm not saying that this was definitely done by him but I would not doubt for one moment that Assad was capable of this act. Try not to be so naive.
AG examines probes deal by new police chief Hirsch's security firm (Haaretz)
from the article: Syria opposition claims Assad behind deadly Damascus terrorist attack