Israel behaves adequately. It is a victim of idiots in politics in Europe, Russia and US. If these three would find a compromise on Syria, Iran would not grow that much as a threat to Israel and not move to its borders.
IMHO, it is of the first importance to keep Syria as a secular state. Only in this case it is possible to talk and agree with Israel and West/Russia and keep peace in the region.
Assad is a bad "manager", he should have been thrown away long ago and Russia should not have supported him. But what was proposed as an alternative? Several mobs of jihaddists and armed thugs called "democratic forces" or "free army", etc. ? Come on, we see this situation (chaos) in Lybia.
Based on these contradictions, Iran increases its influence. Assad is now about 2/3 puppet of Iran and only 1/3 of Russia.