This intrigued me. I did a search. Read the threads and came up that the reason for the upside down cross was because Peter was crucified upside down.
But we are Christians.
So why usurp the sacrafice that gave us redemption?
The upside down cross is on the back of The Chair of St. Peter, and in depictions of St. Peter being crucified (which you only see on St. Peter’s Holy Cards or in stained glass windows featuring St. Peter’s crucifiction.)
The Crucifix with Christ upon it is found:
In the Pope’s Hands
Around his Neck
Above every altar in every Catholic church (or it should be anyway)
Around the necks of our priests and bishops,
We, the Laity, wear it around our neck
It’s above our beds and home shrines
In depictions of the Stations of the Cross
At the end of our Rosaries
On the cover of our Bibles
In paintings in our house
So how are we ‘usurping’ Christ’s redemptive sacrifice by showing St. Peter’s cross in a few places (specifically on the back of the Chair of St. Peter - the chair dedicated to him) when we have Crucifixes EVERYWHERE else?