Yazid b. Mu'awiya

How can I provide evidence to Sunni brothers that Yazid ordered the killing of Imam Hussain (as)? Sayyed Mohammad Al-Musawi	We often hear that the army of Yazid had people who prayed regularly and had memorised the Quran. Why did the faith of such people not get corrected since we hear that Namaz is a mentor that corrects faults within us? Sayyed Mohammad Al-Musawi
What is the name of the poem that Yazeed recited when he saw the head of Imam Hussain (as) and where can I find it in the Islamic sources? Sayyed Mohammad Al-Musawi	Was it written for Ibn Muljam to kill Imam Ali and Imam Hussain to be killed by the order of Yazid in Karbala since both events were foretold by Prophet Muhammad (s)? Should we believe that a person may die prematurely? Sayyed Mohammad Al-Musawi