I respect your concerns Maripat. May be I am wrong. So far I have not found even one person who is affected by his views...
As far as his TV and utube videos,there is one person more in demand,present daily on talk shows on multiple TV channels and people like to listen to him because of his peculiar style and political views. His name is Shaikh Rashid. Both of them are listened to and every word of them is forgotten once the TV is switched off :)
Hasan Nisar takes advantage of the lacunae in our history. It is our own fault the we take the history of 'Muslim kings' as Islamic history. We try to defend some indefensible acts of certain kings who happened to be Muslim. We also defend Persian,Turkish and Mughal civilisation as 'Islamic civilisation'.He acts like an angry young man when he points out how far behind we are left in science and technology...and so on ! These valid points make people listen to him but nobody takes him as a religious scholar.
As I said,I might be absolutely wrong in assessing his potential damage but as of today I don't consider him a serious threat to faith. والله اعلم
You are indeed in a much better position where the question of risk stratification arise. So I will be more cautious about him from now onwards. InshaAllah