Nobody believes they're just targeting missile sites.
The extent of the ground bombardment - against an enemy lacking serious AA capability - and the number of Palestinian dead make it look like a punitive campaign.
Aside from that - Hamas is part of the Palestinian Government, if Israel is going to invade it should have formally declared war - attacking another state without a formal declaration of war is a war crime.
Having said that, the US conducts illegal operations in Pakistan, so Israel's key ally has set the bar very low.
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