I Know about the rift and i know the history of violance between the two and i also happend to know that when the Shia State of Kha’warzam was under attack by Mongols, the Suni Khilafat never helped them and then, all Shias and Sunnis were killed by these Mongols..
I also know that in recent history, when Serbs attacke, killed and raped muslims they never bothered to ask them which school of thought they belong to.. they just killed them…
So did you learn anything from history as u seems to be a fan of history???