Why should i raise?

[Pharity]

Ok i was really lost on this one. I want you to explain why i should raise.

UTG+2 is 18/8/3, but i don't think he is very skilled
CO is 41/8/0.9

Party Poker 3/6 Hold'em (10 handed) internettexasholdem.com

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

Flop: (15.33 SB) 6[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+2 bets</font>, CO calls, Hero calls.

Turn: (9.16 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+2 bets</font>, CO calls, Hero calls.

River: (12.16 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+2 bets</font>, CO calls, Hero calls.

Final Pot: 15.16 BB


Ok my thinking was this: I am probably WA/WB against UTG+2, most likely behind though. The pot is huge so i've got good effective odds to see the showdown if the board and further actions are OK. I cannot protect my hand against CO unless i am WB UTG+2. If i raise the flop i will only fold something like JJ or TT for UTG+2 and it will not protect against CO. Only when i am WB UTG+2 and he reraises my flop raise, CO might muck his hand. Its all about relative position. And since a raise is not for value, not for protection, i cannot fold a better hand and i dont need to fold a worse hand for UTG+2, and i probably can't fold a worse hand for CO if im not already dead, then why should i raise?

Please enlighten me! [img]/images/graemlins/smile.gif[/img]