So? A 60% reduction in the chances of getting the flu is still orders of magnitude better than a 100% reduction in the chances of getting ebola. Also, herd immunity isn't all-or-nothing. I'd expect giving everyone a 60% effective flu vaccine would still reduce the the probability of getting the flu by significantly more than 60%.
I hear that herd immunity only really works when the percentage of people vaccinated is in the high 90s, but IANAD.
Another month, another rationality quotes thread. The rules are: