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.
Official: Top Burundi general assassinated in the capital (AP)
from the article: Syria opposition claims Assad behind deadly Damascus terrorist attack