[Antoninus]

I prefer to think in terms of a half full gas tank. If you need 3/4 of a tank full to get where you're going you'd better make some plans for the other 1/4 if you start out with only half a tank. Optimism by itself won't fill the tank, money and filling stations are going to be required.

Agreed. But how many pessimists raise money and build filling stations?

[templar]

But how many pessimists raise money and build filling stations?

It's the pessimists job to point out the need. Once he's done that his work is done; his professional responsibility discharged. The optimists gotta raise the money and build the stations.