Quote Originally Posted by Thermophille View Post
Loki's exact line is "Ugh, I should have never pushed for that 'no backsies' rule", which indicates that Loki considers himself responsible for the institution of that rule. Why might a god of mischief and schemes institute such a rule? Because I can't think of one that makes more sense than 'keeping people from backing out when they realize they got caught up in a scheme'.
I don't think we know this is why, but it's a very reasonable and sound conclusion given what we do know.