Suckers play?

[RocketPiquette]

Limit .50/1
Hero is BB (6c3d)
3 folds, MP2 calls, CO(post BB) checks, 1 fold, SB calls, Hero checks.

FLOP [board cards 8C,JS,6S ]
SB fold, Hero checks, MP2 checks, CO checks.

TURN [board cards 8C,JS,6S,8H ]
Hero checks, MP2 bets, CO folds, Hero calls.

RIVER [board cards 8C,JS,6S,8H,KD ]
Hero checks, MP2 bets, Hero calls.

On the turn, with the board pairing, I thought there was a reasonable chance nobody had an 8, and that therefore I was ahead. I could have lead the turn. I evaluated to more than 50% the chance my opponent was bluffing in this spot, or betting for what he thinks is value. That's why I called down. Any comment?