A Step 5 fold must people will hate

[John Hurst]

Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (5 handed) converter

UTG (t1985)
MP (t860)
Button (t4005)
SB (t575)
Hero (t2575)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to t1985 (All-In)</font>, <font color="#666666">4 folds</font>.

Final Pot: t2435

I know the Chip EV calculation will dictate a call, but there was more going on in this instance. Myself and UTG were the only players showing any aggression. The 2 small stacks were clearly hanging on for 4th. The most likely hands I put UTG on were:

1) Small pocket pair - 30%
2) 2 big cards - 50%
3) Complete bluff - 20%

I hated the thought of being crippled on a coin flip when I was in a great position to steal more chips in later hands. My main intent in these tournies is not to slide into 4th but to win the tournies. I honestly thought at the time that avoiding this allin and stealing blinds later was the best way to win. Afterwards, I felt weak tight and thus I post here for opinions.

Thanks in advance,
John