KT flops top pair and faces aggresion

[hemstock]

PokerStars 0.25/0.50 Hold'em (9 handed) converter

Preflop: Hero is Button with T[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">3 folds</font>, CO calls, Hero calls, <font color="#666666">1 fold</font>, BB checks.

Flop: (4.40 SB) 4[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, <font color="#CC3333">UTG+1 bets</font>, CO calls, <font color="#CC3333">Hero raises</font>, BB folds, <font color="#CC3333">UTG+1 3-bets</font>, CO calls, Hero calls.

Turn: (6.70 BB) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets</font>, CO calls, Hero calls.

River: (9.70 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+1 bets</font>, CO folds, Hero calls.

Final Pot: 11.70 BB

Villain is quite loose and aggressive preflop but otherwise, he is normal.
Standard?

[Buckmulligan]

Raise preflop; raise the river too.

[DrunkHamster]

I agree with raising the river, but raise PF? I know I PFR less than most people here say is optimal (around 8%), but isn't it fairly easy to see this hand being dominated? Maybe I am just being stupid, but help me out on this. Why is raising so much better than just limping.

[Riposte]

Why raise the river?