On the Fact that Israel Would Apparently Rather Have Syria Controlled by a Bunch of Slant-Headed Terrorists than by a Secular and Mostly Sober Leader Like Assad

The only thing that I can think of is that if Syria is controlled by ISIS and/or al Nusra, the result will be massive internal chaos the likes of which Israel could take full advantage of (a permanent annexation of the Golan Heights being one option). It's not a strategy that I would institute but then I'm not a hard-core Zionist, am I?