suckout, or missed bets?

Unch-gray...

Against a reasonably smart opponent, I cap, because dude would have raised JJ and there's no way he has a 3 - TT is the only hand I'd be worried about.

But a 75 VPIP idiot might very well have a 3, or a stupidly played JJ/TT. You can't assume that, though, and with 12.5 BB in the pot you win often enough to not be just spewing (JT will think they're ahead roughly 90% of the time). Call down.