I don't think the attack could be repeated as successfully even if Israel withdrew. And Israel clearly had justification doing something - but without an analysis of their options, it's hard to know what's justified - which is the heart of this case.
I agree that Israel's options are limited - in the absence of outside assistance. In fact, I don't see how Israel can solve the situation in the absence of a neutral outside security force. Here's why:
For a peaceful settlement, both populations need to be given hope.
- Israelis need hope of long term safety and security
- Palestinians need hope of self-determination and civil rights.
No deployment of Israeli forces satisfies both conditions. If Israel occupies Gaza, they deny the Palestinian hope. If they withdraw, they give up their own (which they won't do). Even if Hamas is destroyed, the PA is too weak to guarantee security for either Palestinians or Israelis, and Israel won't trust them enough to allow them to grow strong. Ergo, a neutral force is needed. But, that would require US co-operation, if not actual US forces, and I don't think Biden will risk it in an election year.
This sounds like the perfect task for a UN peacekeeping force. (Of course, after various "resolutions" over the years, the Israelis may view the UN as biased...)
They won't. It's a fantasy.