In contrast, you can be "less wrong" just by doing nothing, or by being a critic of those who do something.' But in the real world (and even in science), you can never win BIG -- and it's often hard to win at all -- if you never place any bets.

To expand a little on what timtyler said, I think you're mixing up beliefs and actions.

Doing nothing doesn't make your beliefs less wrong, and placing bets doesn't make your beliefs more right (or wrong).

Wanting to be 'less wrong' doesn't mean you should be conservative in your actions.