There is no way that murdering top Iranian officials in an Iranian embassy on Syrian soil was ever going to be anything but a gauntlet thrown down. If it was almost any other country than Israel the world would be outraged. Countries like the USA and Germany didn’t pull support because of things like destroying hospitals and killing innocents, so bombing the embassy of a country as reviled as Iran inside Syria wasn’t going to stop them.
Netanyahu knows his days in power are done very shortly after Israel leaves a condition of all-out war. Biden has told him that, his polls tell him that, and protestors tell him that. I think he’s poking the local bears to escalate and stay in power by extending the conflict. Both Biden and Trump have promised support so Netanyahu is acting with the backing of the world’s largest military no matter who wins. Pulling the USA and other Western countries into another war in the Middle East is his best bet of pushing that day of reckoning way down the road.