Bad play

OK, I played this badly. Should have folded on the flop. But what on earth was the button doing going all-in on the river.

Table "STT 3623710 - 1" Seat 8 is the button.
Seat 1: O__b__1 (2233 in chips)
Seat 2: Alimar (440 in chips)
Seat 3: TumTiddle (935 in chips)
Seat 4: mjp111 (1210 in chips)
Seat 5: Thebine (1547 in chips)
Seat 6: Old Man (810 in chips)
Seat 7: Rochdale (1172 in chips)
Seat 8: Angeloson (903 in chips)
Seat 9: Jhhl17 (750 in chips)
Jhhl17: posts small blind 15
O__b__1: posts big blind 30
----- HOLE CARDS -----
dealt to TumTiddle [Td Kd]
Alimar: calls 30
TumTiddle: calls 30
mjp111: calls 30
Thebine: folds
Old Man: calls 30
Rochdale: raises to 60
Angeloson: folds
Jhhl17: folds
O__b__1: calls 30
Alimar: calls 30
TumTiddle: calls 30
mjp111: calls 30
Old Man: calls 30
----- FLOP ----- [Kc 2h Qd]
O__b__1: checks
Alimar: checks
TumTiddle: checks
mjp111: bets 100
Old Man: folds
Rochdale: calls 100
O__b__1: folds
Alimar: calls 100
TumTiddle: calls 100
----- TURN ----- [Kc 2h Qd][8d]
Alimar: bets 280 and is all-in
TumTiddle: calls 280
mjp111: calls 280
Rochdale: calls 280
----- RIVER ----- [Kc 2h Qd 8d][9c]
TumTiddle: checks
mjp111: checks
Rochdale: bets 732 and is all-in
TumTiddle: is all-in 495
mjp111: calls 732
----- SHOW DOWN -----
Rochdale: shows [Ah Jd] (High Card Ace)
Alimar: shows [4c Ks] (A Pair of Kings, Queen high)
TumTiddle: shows [Td Kd] (A Pair of Kings, Queen high)
mjp111: shows [Kh Qc] (Two Pairs, Kings and Queens, Nine high)
mjp111 collects 474 from Side pot #2
mjp111 collects 1485 from Side pot #1
mjp111 collects 1895 from Main pot
----- SUMMARY -----
Total pot 3854 Main pot 1895 Side pot #1 1485 | Side pot #2 474 | Rake 0
Board [Kc 2h Qd 8d 9c]
Seat 1: O__b__1 (big blind) folded on the Flop
Seat 2: Alimar showed [4c Ks] and lost
Seat 3: TumTiddle showed [Td Kd] and lost
Seat 4: mjp111 showed [Kh Qc] and won (3854) with Two Pairs, Kings and Queens, Nine high
Seat 5: Thebine folded before Flop (didn't bet)
Seat 6: Old Man folded on the Flop
Seat 7: Rochdale showed [Ah Jd] and lost
Seat 8: Angeloson (button) folded before Flop (didn't bet)
Seat 9: Jhhl17 (small blind) folded before Flop (didn't bet)