We know Assad has supported terrorism for years. I wouldn’t have a problem removing him.
But replacing him with what?
I’ve heard Israel’s stance is they support the rebels because the rebels aren’t linked to Iran. They’d rather have bad guys who aren’t linked to Iran than bad guys that are linked to Iran.
Israel’s support for any Salafists/Islamists is a short-term expedient for which the long term cost is not worth it, as they once found with their early support for Hamas as “better” than Arafat. Arafat was simply a “Palestinian ‘nationalist’ thug”, while Hamas is a bunch of Islamist thugs with a trans-national Islamist agenda.