A lot of evidence, if you choose to believe videos coming out of IDF.
But to take a step back, why would Hamas operating from hospitals, schools and mosques surprise you in any way ? Would you then think anything different of them ? This is asymmetrical warfare. Of course they would use anything they can to create an advantage. Let's not kid ourselves. It's the same as using human shields. That's just how this type of war works.
You work with what you have to survive and gain an advantage
