Look at the pictures from the original post.

Imagine the death and destruction caused by the hands of Israel.

Realize that this reaction wasn't necessary. Those who run Israel are adults. They could have chosen a path with much less deaths. They were not forced to commit a genocide, they chose it.

Realize that when people see such pictures, of entire cities completely leveled to the ground, that people get extremely upset. Imagine the place you live reduced to rubble and how atrocious you would find this. The inhabitants of Gaza are humans just like you and the world is justified in their disdain.