Raise river for value?

[TheLemonShark]

SB is very passive, 70/0.4/0.8. BB is a maniac who just lost a big pot and likely on tilt, raises and reraises with almost anything.
Comments on all streets welcome.

Full Tilt 0.50/1 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, SB calls, BB calls.

Flop: (6 SB) K[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">BB raises</font>, Hero calls, SB calls.

Turn: (6 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets</font>, Hero calls, SB calls.

River: (9 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.

Final Pot: 12 BB


If any other person had bet that river I would have reraised, but I decided to call just because he was so passive, afraid of a straight of possible a set. Big mistake?