Of course you dont need trips to play an opponents cards, but personally, I like to bluff when I still have some outs. The thing about small pocket pairs is that when they dont hit, you have virtually no outs. I personally would save this move for when I have more than 2 outs. Still, I would raise here occasionally, but more often that not I fold the small pp after a miss. Remember, you were playing it originally because you hoped it would hit and you thought he would pay you off.