Why do they make these plays?

[ImWeakTight@UCLA]

I see the size of the pot and his odds but how does this make sense
Full Tilt Poker Game #2295769279: Table Canfield (6 max) - $200/$400 - No Limit Hold'em - 20:23:03 ET - 2007/04/26
Seat 1: sbrugby ($67,055)
Seat 2: Vaga_Lion ($83,877)
Seat 3: maxypaxy ($8,594)
Seat 4: jinsokkp ($40,000)
Seat 5: JohnHennigan69 ($20,591)
Seat 6: xi gia ($26,189)
sbrugby posts the small blind of $200
Vaga_Lion posts the big blind of $400
The button is in seat #6
*** HOLE CARDS ***
maxypaxy folds
jinsokkp raises to $1,600
JohnHennigan69 calls $1,600
xi gia folds
sbrugby folds
Vaga_Lion calls $1,200
*** FLOP *** [6s 6h 2h]
Vaga_Lion checks
jinsokkp bets $3,000
JohnHennigan69 calls $3,000
Vaga_Lion folds
*** TURN *** [6s 6h 2h] [5h]
jinsokkp checks
JohnHennigan69 bets $6,400
jinsokkp raises to $30,200
JohnHennigan69 has 15 seconds left to act
JohnHennigan69 calls $9,591, and is all in
jinsokkp shows [Kh Qh]
JohnHennigan69 shows [Qs Ad]
Uncalled bet of $14,209 returned to jinsokkp
*** RIVER *** [6s 6h 2h 5h] [4s]
jinsokkp shows a flush, King high
JohnHennigan69 shows a pair of Sixes
jinsokkp wins the pot ($42,979) with a flush, King high
JohnHennigan69 is sitting out
*** SUMMARY ***
Total pot $42,982 | Rake $3
Board: [6s 6h 2h 5h 4s]
Seat 1: sbrugby (small blind) folded before the Flop
Seat 2: Vaga_Lion (big blind) folded on the Flop
Seat 3: maxypaxy didn't bet (folded)
Seat 4: jinsokkp showed [Kh Qh] and won ($42,979) with a flush, King high
Seat 5: JohnHennigan69 showed [Qs Ad] and lost with a pair of Sixes
Seat 6: xi gia (button) didn't bet (folded)

[Up-grey-de]

tilt..?

[MTBlue]

Its pretty simple he figures that he has better than 30% equity against Jinsokkp's range. The majority of jinsokkp's range is going to be high cards with a heart in hennigan's opinion (which he is a 3:1 favorite against).