Why NOT to Slowplay a Flopped Set

[Tiburon]

PokerStars 3/6 Hold'em (8 handed)

Preflop: Hero is UTG+1 with , .
1 fold, Hero calls, 1 fold, MP2 raises, 2 folds, SB calls, 1 fold, Hero calls.

Flop: (7 SB) , , (3 players)
SB checks, Hero checks, MP2 checks.

Turn: (3.50 BB) (3 players)
SB checks, Hero bets, MP2 folds, SB calls.

River: (5.50 BB) (2 players)
SB bets, Hero raises, SB 3-bets, Hero caps, SB calls.

Final Pot: 13.50 BB

Results in white below:
Hero has 5h 5s (three of a kind, fives).
SB has Ks Jh (straight, king high).
Outcome: SB wins 13.50 BB.

SB called 2 bets cold with KJo, and was 66/8/0.77--of course, over the 230 hands I have him on in my DB, he's winning at 14.96BB/100...I have no idea why I capped the river. Maybe I was in denial that this guy called me getting 4.5-to-1 on a gutshot draw. Lesson--never slowplay a set against a donkey.

[Nortonesque]

I have no problem going for the check-raise there, as long as MP2 has decent aggression. Usually I'll lead into him, but you've got to mix it up every once in awhile.

[MecosKing]

Even if you bet it, youd have lost the hand. If the guy is going to call for the river gutshot in a pot that miniscule, he is going to peel on off with his overcards on the flop, then pickup the gutshot draw and get there.

That said, i also dont beleive in slow playing flopped sets, unless you are pretty sure someone else will do the betting, like if theres a PF raiser on a flop of like KQ6 and you have 66 or something like that.
(Man thats always fun though, isnt it?)