Should you ever fear Quads?

Pokerstars $2/4 NL

Stacks
Hero $400
Villian $600

I'd been running over the table a bit with a rush of good cards in the past 30 minutes, and going all-in either pre-flop or on the river to create a wild loose raising impression (even though the cards were much better than could be expected.) People were asking ARE YOU DRUNK?

Anyway, I got dealt KK under the gun and raised it to $8.

I got one caller and the blinds fold.

FLOP: K93 rainbow

I made a pot sized bet on the flop and got called.

TURN: 9

I made a bet of about half the pot and got called, hoping to create an impression of being on a bluff or continuation bet.

River: 5

I went ALL IN and got called by 99. (QUAD 9's)

Is this just bad luck or was there anyway to avoid this disaster?