A friend of mine in college drove down a (very) long flight of stairs with his bike while being (very) drunk. He was severely injured and I very much doubt based on his recollection of what happened that he would a) have injured himself at all if he was on foot and b) even if he had fell on those stairs, he would have had much less serious injuries.
Sure, but you are comparing statistics for an entire country to a specific incident. Of course there's a non-0 risk, but when it's about traffic and safety it's about acceptable, not complete elimination of risk.
It's still illegal in the Netherlands to bike drunk. I'm sure this would be aggressively enforced in cities like Groningen if statistically there were major safety issues Thursdays and Friday nights with drunk cyclists, but this is not the case.
Not to say that your friend shouldn't have walked instead though. Drunkness is also a sliding scale. Luckily with cyclists the chances are way lower of murdering others.
