How easy should this fold be

[Huckle]

I think you're facing AK/AQ here a lot. I'm nearly counting out KK here because it's likely they want to get their money in preflop.
The only hand to worry about would be MP1 having QQ, then his play might make sense, but I still think he'd want to make his first raise bigger.
Since you have no reads or anything, I'd easily push my stack in here, if you lose it's just firing up another one, and if you win you've got a big stack to play with.

[bawcerelli]

hero needs to learn the term pot committed. someone probably has a flush draw and the other has KQ. just be sure to pair the board on the turn or river.