Backfired slowplays

6-Max Full Tilt $50NL. The players are bad and routinely overplay their hands. Against these types of players, do you think it's better to let them shoot themselves or to get aggressive?

Full Tilt Poker Game #353369414: Table Ontario (6 max) - $0.25/$0.50 - No Limit Hold'em - 20:34:44 ET - 2005/12/25
Seat 1: <font color="red"> Hero </font> ($53.40)
Seat 2: BITEYOASS ($97.50)
Seat 3: whitemike26 ($12.80)
Seat 4: smd17 ($11.35)
Seat 5: james sargent ($30.95)
Seat 6: tsac19 ($25.65)
smd17 posts the small blind of $0.25
james sargent posts the big blind of $0.50
The button is in seat #3
*** HOLE CARDS ***
Dealt to <font color="red"> Hero </font> [A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]]
tsac19 folds
<font color="red"> Hero </font> raises to $2
3 folds.
james sargent raises to $3.50
<font color="red"> Hero </font> calls $1.50
*** FLOP *** [A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img]]
james sargent bets $0.50
<font color="red"> Hero </font> calls $0.50
*** TURN *** [A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img]] [K[img]/images/graemlins/diamond.gif[/img]]
james sargent bets $15
<font color="red"> Hero </font> calls $15
*** RIVER *** [A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img]] [T[img]/images/graemlins/heart.gif[/img]]
james sargent checks
<font color="red"> Hero </font> bets $11.95

I think the river bet is a bad idea, but other than that, how is it? Preflop, I don't want to reraise and then get forced to call a big bet.

Hand 2:
Full Tilt Poker Game #353410671: Table Ontario (6 max) - $0.25/$0.50 - No Limit Hold'em - 21:08:10 ET - 2005/12/25
Seat 1: <font color="red"> Hero </font> ($41.55)
Seat 2: BITEYOASS ($64.50)
Seat 3: whitemike26 ($23.95)
Seat 5: james sargent ($67.65)
Seat 6: tsac19 ($60.25)
<font color="red"> Hero </font> posts the small blind of $0.25
BITEYOASS posts the big blind of $0.50
The button is in seat #6
*** HOLE CARDS ***
Dealt to <font color="red"> Hero </font> [K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img]]
james sargent calls $0.50
tsac19 raises to $1.50
<font color="red"> Hero </font> raises to $5.50
2 folds.
tsac19 calls $4
*** FLOP *** [J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img]]
<font color="red"> Hero </font> checks
tsac19 checks
*** TURN *** [J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img]] [K[img]/images/graemlins/spade.gif[/img]]
<font color="red"> Hero </font> bets $6
tsac19 raises to $12
<font color="red"> Hero </font> raises to $29
tsac19 raises to $54.75, and is all in
<font color="red"> Hero </font> calls $7.05, and is all in


Given the players, I think only the river bet in hand 1 was my mistake in these two hands. Thoughts?