Even If it was used by Hamas, which IDF provided no proof of, murdering children in cold blood is not an answer. Though, US might learn from it and next time when a school shooter takes your classroom hostage, they will just drop a bomb on it. Israel is a genocidal state.

Of course there was! The UN is well-known for their mandatory terrorist-hideout-bunkers in every school, office and carpark.

Since I saw the first downvotes: /s, people!