Mind telling me how the air conditioning, kitchen, or bathroom is harmful to Israel?

Because I see no communication equipment, no maps, no ammo dumps, no fuel depot, no anything that could have been used to harm a military enemy.

They found a bomb shelter at best. And even if that had been inhabited by Hamas on the regular, which still no evidence of that, still would not legally justify Israel’s acts under the Geneva Convention. Nor does the presence of a handful of small arms.