Tatbeer – Ban on bloodletting on Ashura

So who wants to do Tatbeer, he can do it in his house away from the eyes of people; thus, this is better as his work will be devoted for Allah if he really asked for the face of Allah by his work.
Whereas who does it in an arranged and grouped form and in front of simple people especially the dissenting people and non-muslims , then they are causing people to alienate from Islam and thus their work is HARAM