Nosherwan, you were also saying that we should not overlook all other "good" things he has to offer.
But have you realized what will be the result if Muslims are willing to forgive such blasphemy against Prophet's family? This will be a green signal for other blashphemours to go ahead and make similar claims against Prophet of Islam and his family.
This will also make Zakir Yazidi see that he can get away with his blasphemy and continue his "business" as usual.
Would you have forgiven him if he had done similar blasphemy against Prophet of Islam himself? Would you still continue to eulogize him for other "good" things he has to offer?
If not then how can you say that about the grandson of Prophet of Islam for whom Prophet said "Hussein is from me, and I am from Hussein." And that is just one hadith about Imam Hussein.
It is amazing that people like him support killers of Prophet's family and then go ahead proclaim themselves to be "super" Muslims.