Pot control or bet it hard?

Recent posts made by Fnord made me thinking "is it ALWAYS appropriate to bet hard every street?"

I have :Kc: :Ks:

I open raise 4BB and get single caller.

Flop: - Hands that beat me are AA, 22 and 6x. I pwn lower overpairs and have them on 2 outs, I have 4 outer to 22 and 2-outer to 6x.

I check. He checks it back.

Turn:

Good card, now I can stack other lower pocker pairs and 22 can kiss my butt.

I pot it, he pushes and I call.

River:


Results in white:
He flips over his pocket deuces for counterfeited underfull and MHIG.