I'm sorry for your relative, and of course you should always do things like driving (diving, cycling, sailing, climbing - or even cooking and cleaning) as if a tiny mistake could cost you everything: that's because it's actually true. These activities will never be risk-free; the best you can do is bring the risk down to a level comparable to that of alternatives (with "just don't do it" included in the set) and hope no unfortunate incidents occur to you.

It's still worth noting the relative probability: death or life-changing injury is basically what happens in every single accident when you're going 200km/h on a highway surrounded by (what could as well be) steel walls moving at the same speed; in my use case, when not exceeding 40-50 km/h and using roads where other users basically stand still most of the time, you need a pretty specific conditions and a lot of bad luck to even have an accident, much less die or become permanently disabled as a result of one. Still, not a zero probability, but the difference between 100% and 0.01% is kind of noticeable.

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