Will the Sunni and Shia killing ever stop? I don't understand why we Muslims cant accept each sects differences. You can choose to not agree with what they say but I don't understand the killing between these sects. Beside that nothing historical will change. We Muslims today are so quite on this subject, the only time someone brings it up is when they want to slander the other.
Sunni and Shia Muslims generally live peacefully together throughout the world, there is actually very little violence, and the cases of violence are almost always due to foreign influence. US, Israeli and Saudi intelligence arm and train Sunni terrorists in Iraq in order to weaken their political rival (Iran), and Iran does the same for the Shiite in Iraq in order to fight back against its enemies. It is nearly always about politics, not religion.
Religion is one of the favorite tools used by intelligence agencies when they want to attack their enemies. The United States funneled hundreds of millions of dollars to Sunni jihadists in Afghanistan in order to weaken the Soviet Union, as I explain in my essay Why Most Terrorists are Muslim.
In my experience most educated Shia and Sunni Muslims do not care about sectarian differences and are quite happy to live peacefully together. I grew up in Iran and speak Farsi so I am familiar with Iranian Shia Muslims and their culture.