I find this very strange.
I have flown nearly 3 million miles and have never been removed from an assigned seat.
And if I had a booked seat and I was asked to move I would ask “why” and then not move until that was answered or until they sent security to move me, who I would peaceably accompany.
This doesn’t make sense at all.
Why the big deal about moving to another seat?
You would be in jail if you did not comply. These people in charge are not adults,and have had bad PR lately and still do not get how bad they look.