I don't see the controversy here, MP is just as likely to have 34s, statistically and given the action, 56c, A5c and A2c and even KQ/AQ are also possibilities. The button could have AA/KK/AKc as well as QQ.

More importantly look at the pot odds, assuming MP calls the push, its $60 to win $240 or 4:1. Even if a higher set is out there 70% of the time (A very pessimistic prediction) it is still +EV to call.