Perhaps Hamas believes that kidnapping many Jews will give them an advantage at the negotiating table, they can use hostages as human shields, believe that Israel will have to compromise and do not dare attack Gaza because the safety of the hostages.
But now, Israel does not care much about this issue. Jews only want revenge.
Therefore, the greatest possibility is that Hamas will ask third parties to intervene, and launch media campaigns condemning Israel, putting pressure on Israel to stop the military campaign.