Playing a LAG (loose aggresive player) can be tricky you never know if they have it and most times they dont they just want a race and will call with any draw somtimes they hit. you made the right call i think 9 out of 10 times you win a huge pot. that late in tourney LAGs will all in any pair and with 60% of your chips in its a no brainer dont beat yourself up. others may play more passive but i would have done the same good luck