Why Missionaries venerate murderous tool that was used to kill son of Mary?

Why Missionaries venerate murderous tool that was used to kill son of Mary?

It is puzzling for any impartial observer that the son of Mary was crucified on a Cross, so it is a murder weapon by which Whites (Romans or Pagans) and Jews killed son of Mary. As per the times (2000 years ago) the ruling class served the justice as per their criminal code on the books of the day. We in this 21st century can not have prevented such atrocity on son of Mary. It was a heinous crime committed on a innocent son of Mary by Whites (Romans or Pagans) and Jews(#1).

In this day and age no victim's kin want to keep or hold or touch or hang around their necks the very murder weapon that was used to kill the person. In modern times, for example the Government kill criminals by poison injection, electric chair or by hanging or by shooting with gun. Did you see or heard any stories that any body in the world venerate or keep or hang around their necks the very murder weapon the Government used? No.

So who are these Missionaries? And why they wield and hang cross across (#2) their necks? Are they in the side of son of Mary (Victim) or in the side of authorities (Whites or Romans or Pagans and Jews) who killed the son of Mary.

Let the informed reader judge, who these (Christian Missionaries) people are? And what are their real motives? Why they hijacked son of Mary to fulfill their sinister goals.

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(#1). Illustrating the historical fact. The reference to Jews was used in good faith, to illustrate the historical fact. Jews are good people, who mind their own business.
(#2). Cross was the murder weapon used by Whites (Romans or Pagans ) and Jews to kill son of Mary.