They plan to punish the non-Hamas actors responsible, IOW. Otherwise, they'd have demanded the UN condemn Israel. Thanks Eleutheria5.
"The most moral army in the world will not be lectured by those who have indiscriminately bombed civilian populations for years," Netanyahu said
Or they’re going to scapegoat the group most capable of challenging their authority, and use the missile strike as a pretext to either take them out or have the IDF take them out.