iSteve commenter Andrew M suggests in response to Jonathan Kay’s valuable analysis of Super-Spreader Events in Quillette:
The common thread between all these SSEs is “events you would still attend even if you weren’t feeling great”.
Going to a wedding or funeral? Pop a couple of Tylenol and enjoy seeing the extended family. Going on holiday with non-refundable flights booked months in advance? You’re not going to cancel that. If this had hit later in the year, graduation ceremonies would be another huge SSE.
By contrast, going to the movies is very easy to cancel. Driving holidays or one-day breaks (local theme parks) you’re more likely to cancel. A restaurant meal with friends is easily rescheduled.
In the past, I seem to recall airlines offered free cancellation or rescheduling. Maybe that needs to come back, even if it pushes up ticket prices.
A friend suggests that in the future airlines should allow you to back out of a ticket if you feel ill all the way up to the time of boarding in return for a voucher.