I need my pessimism
It's an integral part of what makes me, me. I also need my scepticism, my bullshit detector and my immediate, reflexive and unrelenting response to anyone spouting buzzwords or inviting me to a "meeting," which is mangler-speak for wasting every bugger's time while trying to reassign credit for achievements upwards in the hierarchy of incompetence.
Quite aside from us being nobody's fools, these qualities allow us to navigate the fog that lays heavy and grey across the rolling, bull-pat littered landscape of this industry. Misanthropy, assumption that everyone is an arse trying to make your life difficult, a healthy aversion to giving anyone money for things that can be done in-house, never being at anyone's mercy for data recovery, being very stingy with permissions, having two-part epoxy for USB ports and having root would also be advantageous in this position.