If Israel's reason for keeping the Golan is as a "high-ground buffer on the Golan" between Syrian forces and it's civilians then what is your justification for Israel colonizing that buffer zone with its own civilians? After all, that brings them into range of the very same Syrian guns that the occupation is supposed to make impotent. Perhaps there is more motive behind Israel's thinking than you are willing to credit.
Islamic State destroys part of Syria's Temple of Bel, monitoring group says (Reuters)
from the article: Syria diplomat: No preconditions to negotiations with Israel