Good River bet or insanity?

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Button is loose aggressive. MP2 is tight aggressive.

PokerStars 2/4 Hold'em (9 handed) converter

Preflop: Hero is CO with T[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">MP2 raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, Button calls, <font color="#666666">2 folds</font>, MP2 calls.

Flop: (10.50 SB) 5[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
MP2 checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, MP2 calls, Hero calls.

Turn: (8.25 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
MP2 checks, Hero checks, <font color="#CC3333">Button bets</font>, MP2 folds, Hero calls.

River: (10.25 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font> ...