And what good does launching these useless firecrackers into Israel achieve? They have done it a 100 times before and achieved nothing. You know Israelis will come back and hit you a100 times harder. Hamas are idiots of the highest order, they just want to stir shit up to get headlines which in turn translates into donations.
This also gives Israel justification to bomb the shit out of Gaza, if the international community questions them. Their PR game is already top notch, this just helps them sell their kool aid easier.