You really don't want to attack Tel Aviv. Nope, that would be a really, really bad idea and one that would guarantee your corporeal carcase would become a smoking cinder.
There is the notion of counter value. The Israelis have capability of reducing Assad’s palatial homes to cinders. So far, they have only attacked military assets that threaten their population. Assad abets Iran not so much out of ideological sympathy, but lust for power and luxury for himself and his family. Luxury is best enjoyed in peace time conditions.
The last thing Assad wants is war with anyone. His embrace of Iran is a marriage of convenience, since Iran and their proxies Hezbollah supply the muscle that keep him in power. Israel provides a convenient distraction from his corruption and betrayal of Syria.
The current unrest is largely the result of Obama’s destabilizing influence in the Middle East. Obama, Clinton and Kerry have accomplished little other than getting a lot of people killed unnecessarily. (Granted, a bullet through Qaddafi’s diseased pumpkin was a beneficial side effect.)