All of which is on the person who instigated the physical stuff, (UA Staff) by calling for security and then trickles down to the Airport Security thug who did the manhandling.
Icarus - If someone tells you to do something that is in all respects intrinsically wrong do you go ahead and do it? No, thought not. Self inflicted? Nonsense.
The Bullwinkle - Yes, I realise only the captain can release the jump seat and would have expected the ground staff to have cleared this first, for a 45 minute flight I would expect the same company crew to cooperate, as mentioned, acting in the best interests of the company.