You can disagree with this condemnation, but this condemnation is in no way “mindless”.
Imam Hussein was the grandson of the Prophet of Islam himself. and his family was Prophet’s family. He was killed along with his family because he refused to pay allegiance to Yazid, who was a usurper of khilafat of Islam.
And with all his obvious crimes against Islam and Prophet, Zakir Naik wishes that Allah bless him?!
As I said, you can disagree with the above assessment, but calling it “mindless” is itself mindless.