[Socratic]

"It is evident that one key to this situation is Hezbollah."

And another key is that Syria abuts Israel only in the corner of the Golan Heights. Lebanon affords a larger border to Israel for the purposes of infiltration.

[Billthedrill]

Between Lebanon and Israel, however, is an impenetrable Maginot line called the UNIFIL zone, where hardened warriors from the UN guarantee the safety of the Lebanese homeland from the marauding IDF hordes...

OK, so I'm kidding. They're a bunch of no-loads who regularly allow Hezbollah to mount demonstrations and missions against Israel. No children in the area unarmed enough to rape, I suppose. If Israel decides to play directly they will, as you suggest, come in through the Golan. I hope they don't, actually. It might cause more problems than it would solve.