JJ, facing unknown and loose/passive

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PF raiser is an unknown. Turn raiser is loose/passive. I think I played this a little too aggressive on the flop. My thought processes were since the calling station was padding the pot, I can cap and slow down on the turn/river. Instead he wakes up on the turn representing the straight and I have to lay it down.

Paradise Poker 0.50/1 Hold'em (7 handed) converter

Preflop: Hero is MP2 with J[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP1 calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">SB 3-bets</font>, <font color="#666666">1 fold</font>, MP1 calls, <font color="#CC3333">Hero caps</font>, SB calls, MP1 calls.

Flop: (13 SB) 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, MP1 calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, MP1 calls, <font color="#CC3333">Hero caps</font>, SB calls, MP1 calls.

Turn: (12.50 BB) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">MP1 raises</font>, Hero folds...

My thoughts are, on a coordinated flop like this, it's possible I can have the best hand, but the draws can likely make my equity too low on the flop to raise for value. What should I do in this situation against an unknown who doesn't seem to be slowing down?