The Importance of Hijab
Some of the rituals are performed by shirtless men in public and are witnessed by members of the opposite gender. This is frowned upon in Islam and has been prohibited by some scholars:
Ayatullah Khoei: “2830. There is no harm in beating one’s breast in the streets and bazaars (i.e. as a sign of mourning) though the women may be passing from there. However, on the basis of precaution, the mourners should be wearing shirts. Furthermore, there is no harm if standard (‘Alam) etc. are carried before the mourning party, but instruments of amusement should not be used.” – Source.
The scenes of these shirtless men is also very unsightly.