I came across a post on Facebook which tried to celebrate how the "old ways" (when we were kids) are better, which went along the lines of:
Like this post if you used to cycle around on your bike as a kid without a helmet and survived.
(attempting to prove that kids these days are too "wrapped in cotton wool" and that the "need" for kids to wear helmet while cycling was just paranoia)
The obvious flaw is that anyone who cycled their bike without a helmet and didn't survive are not in a position to argue / do an angry face, so there will be an inherent bias in the results of the "survey".
(If we just ignore for a moment that people can argue on behalf of friends or relatives or people who were merely severely injured could raise their voices)
Is there a name given to this kind of bias / fallacy? I was thinking "selection bias" but the description of that on Wikipedia (https://en.wikipedia.org/wiki/Selection_bias) doesn't seem to quite fit.