You are confused. In order to do war crimes, you must be a group of legitimate combattants. Hence the Israeli side can commit war crimes, but Hamas cannot as they are not an army created by a legitimate government. For irregular combattants, this is called "terrorism" or just "crime". As a result, the nurses do not lose any Geneva Convention protections at all. And as a second result, all your allegations need to be individually proven in a court of law. Oh, and you just advocated for committing war crimes. Nice.
Incidentally, that is one main reason why the military is useless in fighting terrorism. It always results in an asymmetric conflict where the military is either ineffective or will be committing war crimes and thus making the situation worse by losing legitimacy. As can currently be observed nicely.
Don't get me wrong. I do not support either side here. It is religious fundamentalist murderous assholes on both sides that do not mind one bit killing tons of civilians. You know, the worst the human race has to offer.