Nobody ever said Israel can't fight back, that is a straw man argument.

But If a school shooter holds a bunch of kids hostage, the FBI doesn't bomb the school killing all the kids in order to kill the shooter and then say "it is his fault, he was using human shields."  Stop and  think about how psychotic and murderous that viewpoint is.  How have they have twisted your mind into accepting that psychotic view?  No, the FBI waits for a clean shot and tries to protect innocent people.

The reason is that psychologically healthy human beings care about innocent human life.

Clearly Israel does not.