why don't the characters resist their execution

this is probably a stupid question as im not too well versed on the detailed lore of these games (I only really understand the basic story) but it seems like when its someones turn to be executed they just let it happen and sometimes even participate in the execution itself.

like lots of the characters just sit there and let whatever machine is gonna kill them just run its course and get the job done. I hate saying "but if I WAS THERE" but seriously if I were there I would at least try to resist or run away or just do ANYTHING to not let monokuma's mockery and sadistic spectacle go according to plan.