Yeah, well a stable Syria pretty much sucks too.
On the other hand, Muslim zealots are irrational and unpredictable, never satisfied, and bent toward martyrdom. Since each of their butt-kickings only guarantees a new generation of vengeful enemies, the only remedy is their perpetual extermination.
Given the choices, Israel certainly prefers the late devil's son and former London ophthalmologist, Bashar al-Assad. As they say, better the devil you know...
Give him back the Golan, he’ll love you