In general, extremists seem to fear moderation more than they fear opposite extremists. Hamas may cry foul about these attacks, but maybe this sort of intervention is what keeps them relevant. A secure and lawful Palestine would have little place for the antics of Hamas's militant leadership. And the leaders who prosecuted the invasion of Lebanon to save Israel from Hizbullah are now pursuing the Hamas bogeyman with excellent zeal.
What both these sides may fear most is elections in Israel and U.S. leading to more constructive engagements that will, slowly but surely, leave them behind the way the IRA in Ireland succumbed to a reconciliation of former enemies through a political process.