Unfortunately...
...the more we adhere to pessimism as a strategy, the easier it is to manipulate us with cost-effective tactics like fake chatter. In fact, in this context too much pessimism becomes panic, as we do ourselves in imagining all the terrible ways that terrorists are planning to do us in.
I'll vote for caution and prudence, but I'd be careful about giving in to pessimism...it's not far removed from fear.
