[beardicus]

yes, your example is still about risk mitigation, but it's also a not-so-effective slippery slope argument likely motivated by a contrarian anti-masking stance. the reason there is no social pressure to helmet at all times is that we generally agree as a society that the inconvenience is not worth the minimal risk reduction.

this risk calculation is messy of course, as we all have different tolerances for inconvenience and risk, and we also have different responses to individual vs. collective risks.