I think what's missing here is that Israel trying to defend itself from Syrian aggression. Israel's occupation of the Golan heights is in response to multiple Syrian invasions and attacks from the position, and Israel has offered to return the Golan heights to Syria in return for peace. Unfortunately, Syria still chooses not to recognize Israel, and as you point out, hosts Iranian forces on Israel's border. It's fair to say Israel has violated international law in an attempt to protect its sovereignty from Syrian aggression.