If mere support is a hangup, then supporters of Israel's genocidal retaliation must similarly be excluded from talks.

I speak sardonically, of course: preconditions to negotiation are rarely helpful to achieving a negotiated outcome.

Here's one example: if Israel starts by treating Palestinians as human beings equal to Israeli people, without preconditions, it would remove a lot of Hamas leverage, plus it's the right thing to do.

Then, a bilateral peace committee seeking to punish genocide perpetrators on either side, perhaps as judged by the ICJ, can be established.