Why is that? Because it moves the conversation away from the terrorist aspect that people want to argue has been going on for hundreds of years, back to biblical days, and that people must accept it because Jews are gods chosen people. It brings it down to a different level, children are incapable of fomenting as terrorist but, as Elon put it, can become learned behavior, meanwhile in Gaza, they are being slaughtered/starved as a consequence of the actions between adults who are fully capable of fomenting, and carrying out those actions successfully. It is not propaganda, it's a last ditch attempt to move the conversation away from the arguments justifying it.