Yes but let's look at this gentleman's reported behaviour.
Could have walked around in economy and stood in an exit area to exercise but, instead:
Walked into business.
Refused to leave.
Kicked off to the point where the cuffs came out (I can assure you that decision is NOT taken lightly).
Perhaps, just perhaps, the requirement to defecate could have been a ploy - Yes? No?
(In a life before aviation I had that one tried on me. It didn't work for him either!)