Why Shia Muslims Beat themselves with knives and swords?

They are not a part of True Islamic Spirit so don't consider them Muslims

When did matam (Self torching with knives and swords)started? and who started it?

1. Moez Dola Dehlvi Invented it.. It was some person, for some reason He wanted Shias to beat them selves
   so He started this tradition

2. It started 290 years after Imam Hussain A.S (grand son of Prophet Muhammad)'s Martyrdom.

I don't know the purpose of this, but when you talk to them about this matter. the Shia people
They say they are in solidarity with Imam Hussain A.S which is really not true.
No one asked them to beat themselves. and hurt their 6 months old childrens with knives and bleed them

These are sinful people. and these type of people Prophet Muhammad (S.A.W) clearly said
someone who starts a new tradition in Islam is not a part of Islam. Islam was completed
during his own age.. and we have it in the form of Quran.

So if you see someone hurting His child with knives or Hurting Himself with swords other other things and bleeding himself.

and you are thinking oh This is what Muslims are... you are totally wrong..
Prophet Peace Be Upon Him, clearly kicked them out of Islam, just because Islam is a religion of peace, love and harmony

You are not allowed to do weird things and malign Islam , or Malign Hussain A.S
Next Time you see someone doing these crazy things near you. Strike against them. and kick them out.