The negotiatons can be considered a big success because Israeli leaders did not order the murder of the negotiators this time. This will open doors for more realistic negotiations in the future.

I think that murdering the negotiators on Pakistani soil would risk bringing a very big country that has nukes to the conflict, and they would not be siding with Israel.

Israel is vile enough to want to do this, but probably not suicidal enough to actually do this.

Hitler regularly negotiated with other leaders, should he have been off-limits as a target? Why should it be any different with Hamas leaders, who sometimes negotiate and sometimes organize terror attacks?