Labeling something “virtue signaling” implies acceptance that the action in question is beneficial. So you agree that getting vaccinated is a good idea, but somehow manage to still take issue with people saying as much in a slightly more direct manner?
Yes, the group of unvaccinated people, making up 99.5% of recent US deaths even though they only represent about 40% of the population is, almost tautologically, in need of protection. Considering the US has, once again, managed to neatly divide into the same ideological camps as on any other issue, there is no obvious selfish motive for people of the one group to care for the other. This leaves the latter group stumped, because they can’t think of any non-selfish motives, forcing them come up with I’ll-defined terms such as “safetyism”.
The term you’re grasping for is “altruism”, by the way. Although I’ll freely admit, limited to me, personally, that it’s supply is running low and I mostly want people to get vaccinated to finally get this over with.