Most baserunning mistakes happen when a runner does not try to take an extra base, not when he gets thrown out trying to take an extra base.
Got that? Not making an out: bad. Making an out: not as bad. Somehow, I really think that this is not the case. In fact, even if it is literally true that the greater quantity of mistakes are passive, the enormous gap in the magnitude of the mistakes makes the point totally worthless. Given that you are going to make a mistake, make the mistake that doesn't cost your team an out.