[Netz]

Agreed but an Assad victory will enable both Hizbollah and Russia to have boots on the ground on Israel’s Golan Heights. That means Hizbollah has Israel covered from the north and northeast.
Without Hizbollah, Assad would have lost already and if he wins, he will be deeply indebted to those animals.
Now, I guess it’s the lesser evil.

[MasterGunner01]

The demographic breakdown of Syria tells the tale: Alawites (Assad's tribe of Muslims), Shi'ite Muslims, Druse Muslims, and Christians compose a 26 percent minority of the Syrian populace that rules Syria; the 74 percent majority are Sunni Muslims. If the Sunnis take over, you're going to see genocide on a scale that would make the most rabid Nazi blush. That fact is what motivates Assad and the other minorities to fight.

Assad also knows that Israel could vaporize Syria if he decides to get aggressive with them. Assad is a survivor; he is not suicidal.