Shia sunni hate syndrome has nothing to do with present mullahs. No point abusing them, they are just followers of history and are small fries. The roots were bifurcations in the beginning of islamic era between Ummaids, Abbssites and Iranian influences. Those mullahs are now dead but left an ever going war.
But i suppose it will be all over in few generations, when muslim will be more environmentally educated, a changing world and globalization. Thats why its very important to restrict religion to home, mosque, church or mandir. Its power on streets and in state affairs is always dangerous. Street religion is a high octane fuel on the fire of power games.