Why do Sunnisand Shias hate eachother

Because they both claim to be representing the true and righteous path.
And nothing winds up a true and righteous path follower more than someone else claiming that they are actually following the true and righteous path.

It is true that the vast majority of deaths (over 95% IIRC) in the Middle East in the last decade have been caused by Islamic sectarianism/nationalism. Although it could be argued that the removal of authoritarian dictatorship allowed the sectarian conflict, which had been violently suppressed for years, to resurface. I think the Coalition planners simply didn't realise how desperate the various factions were to get at each others throats. I guess that they assumed that the opportunity of liberty, democracy and reconstruction would be more attractive than a descent into a bloodbath of revenge and oppression.

Because Sunni terrorists always attack Shias. ISIS, Al Nusra, FSA...all Sunni terorist organization.

Shia dont hate, only Sunni extremist do.

Before anyone attacks me I am not Muslim, neither Shia or Sunni

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Zoroastrian?

Nope

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Atheist?

It's this, but, because they are both claiming to be Muslim each sees the other side as apostates and blasphemers, which under both Islamic interpretations is punishable by death. It's arguably one of the worst sins/transgressions one could be guilty of in the Islamic faith.

More over, for any Muslim to suffer someone doing this, spreading a false narrative (blasphemy) about Islam would be punishable by Allah, they would go to hell for not defending the faith.

From a historical context, and I'm by no means an expert, the split occured after Mohammed dies, one side thought Mohammed's family should be the representative/interpreter of Islam on earth, the other side thought that Islamic scholars should be. And I'm sure someone will correct if I'm wrong.

Because they both claim to be representing the true and righteous path.
And nothing winds up a true and righteous path follower more than someone else claiming that they are actually following the true and righteous path.

It is true that the vast majority of deaths (over 95% IIRC) in the Middle East in the last decade have been caused by Islamic sectarianism/nationalism. Although it could be argued that the removal of authoritarian dictatorship allowed the sectarian conflict, which had been violently suppressed for years, to resurface. I think the Coalition planners simply didn't realise how desperate the various factions were to get at each others throats. I guess that they assumed that the opportunity of liberty, democracy and reconstruction would be more attractive than a descent into a bloodbath of revenge and oppression.

knew id find you here

Stalker!