Why other members of the congregation of Jehovah's Witnesses cannot be present on a disfellowship of a member?

this is one of Jehovah's witnesses non scriptural practices and tactics.

that way they can manipulate their members, they can press them, humiliate them, faulty accuse them. the bible shows that the average Jehovah's witness has also rights. in the old testament he could go to the elders located in the gate of the town to find justice from the wrongdoer. that was in public. again we read in the new testament that all discipline were publicly given. they do not fear the grate God Jehovah. but in his appointment time He is the one Who will punish them hard according to their deeds.

- Matthew 24:48-51