I see your reasoning here, but if our aces are good it would be an awful mistake to give up this good-sized pot.

So our pair is possibly good, and the BD flush draw adds value. I really want to see the turn card.

By staying in for the one bet, we get to gain some valuable info. Say MP raises and BB 3-bets....we can then safely fold. And if we're assuming good players here, MP has to almost certainly raise or fold, and I would look to see BB's reaction.