Thanks to the mistakes of others, I've never scored in my own goal while testing a virus. When I'm tasked with protecting an environment, I consider the human risk. Traditionally, I've done this by trying to make the system foolproof. But every time, a bigger fool than I ever imagined comes along and proves me to be the fool for thinking I could cover all the angles. This has led me to the inescapable conclusion that something must be done to reduce the risk posed by users.
Fear is a good short-term motivator.
But the more we fear something, the stronger our urge to investigate becomes, to check that the fear is justified. And when we find that someone misled us, we never trust his warnings again. Humans adapt, so we quickly become accustomed to whatever level of fear originally motivated us. When you drive past a pileup on the freeway, you slow down for the next few miles, but soon afterward, you're speeding again. In my view, our best hope is to show users the consequences of their actions and educate them about the reasons why we ask them to take precautions.