Imamate (Divinely Appointed Leadership) is a very high position, and it is only Allah who can decide who is qualified for it. And if the Prophet Muhammad (S) announced to the people that the Twelve Imams are the leaders, or that the Ahlul Bayt are the people that we must refer to, or in that Imam Ali is his successor, it was only because he was asked...
faith in the Day of Judgment, a day in which all men will be resurrected and presente...
He has made them (the angels) the trustees of His revelation and sent them to Prophet...
Twenty Traditions from Imam Hassan al-Askari (as)
Islam does not forbid any sort of good and respectful relationship between the people...