To be fair, this is not a Muslim event, it’s a Shia event.
They’re something between 10% and 20% of Muslims.
To be fair, f 10-20% of Christians were required to “celebrate” their religion by cutting, beating, and slashing themselves and their children, then all of Christianity would be labeled as monstrous (Oh - wait - it already is labeled that... )
Exactly! Sunni do not celebrate this and they are the majority of Islam.