Re: matam saterted...
The certain way of men hitting their back with knives/chains i.e Zanjeer Zani might have been started afterwords but an incident of letting out ones blood in the giref of Imam Hussain [as] is said to have first happened when Bibi Zainab [as] hit her forehead with the steel bars on watching the detached head of Imam [as], the living Imam of time i.e Imam Zain ul Abdeen [as] was also present at that time and there was no condemnation of that act rather it was said by him that she was a knowledgable scholar. (something on those lines).
So why do you guys ride in cars? The prophet (saww) and ahl-e-bait used camels. How can you follow act so religiously and ignore the others?
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sadiqhassa**n you are doing something which the Quran forbids you to do(harm yourself) just to follow a tradition.