This is what you think there is no proof that he order the killing of Sayyiduna Husain (r.a).
Ibn Katheer in Al Bidayah Volume 8 page 231 stated that the Prophet (Peace Be upon him said) said: Justice shall rule my Ummah until the first individual who shall destroy my Deen, from the Banu Ummayaa his name shall be Yazeed.
Yazeed is accused of destroying the Deen by the Holy Prophet (saws) himself......and your great leader Doctor Zaik Naik praised him.
Tafseer Ibn Katheer, Volume 3 page 128: "Abu Said al Khudri narrates that he heard Rasulullah (s) say after 60 Hijri undeserving people shall ignore prayers and enter the deepest part of Hell".
And Yazeed became the leader after the 60 Hijri....yet your great leader Doctor Zaik Naik praised him.....shame on him...punishment is just waiting for him....clearly he is a guy that got big headed just because he know's a lot of interpretation's of the Quran.
Ya Nabi al Mawadah page 223 Chapter 91: Yazeed wrote a letter to Walid his governor: ‘Force Hussain, Abdullah ibn Umar, Abdullah ibn al-Zubair to give Baya and don’t spare them’
When Waleed read Yazeed's letter he consulted with him in regards to this matter and said: What do you think we shall do?’ He (Marwan) replied: ‘I see to send to them now and ask them to give baya and obey us, if they accept then we will let them go but if they reject you shall arrest them and strike off their heads
Yet you support a fool that praised Yazid....so instead of telling other people that they are not Muslims...one should look at them selfs first before questioning others. As the Beloved Holy Prophet (Peace be upon him) said don't point fingers (looking) for faults in others, when you point a finger at someone there are 3 fingers pointing back at you. You are clearly demonstrating this.....who are you to question what is right and wrong in Islam.....you are not a divine being that has such a luxury.
There are many more such examples I can give in where Yazid was responsible for the death of Imam Husayn (Peace Be Upon Him).