Assad is a tyrant and hates Israel. The 'stable' thing about him is his continuing hatred of the peple of Zion. It is consistant and unabating and predictable which meets the West's criteria for 'stability'. He is a patsy for Iran. There, that is all the good things I can think of to say about him in relation to Israel.
Egypt to hold parliamentary election in 2 phases starting Oct 18-19 (Reuters)
from the article: Assad's fall could deliver Lebanon to Iran and Hezbollah