My own margin is on a slider. I have taken huge risks knowing I was taking them, and I fully committed to that risk. In doing so, I placed very high value on a successful outcome, and devalued everything else in my life—occasionally including life itself. This is inexcusable to some people, and I respect that view, but I accepted a bad outcome knowingly, and knew the margins intimately.
Pay attention when it matters.
I have a superstition and distrust of ever claiming to be “safe.” I believe that mild paranoia is appropriate most of the time, and I don’t want to lose that margin, or rationalize real hazards..... As with anything in life, looking at the problems directly and figuring out how to solve them will lead to more margin.
Bloke knows what he's talking about. It's an attitude and method that can be applied to any physical activity, and most important in those where there are significant risk factors..