So I think vaccines are pretty useful, but against the flu? Seems like an overkill to me. I don't sleep in a tent in the wilderness, I live a medium sized city

So I think vaccines are pretty useful, but against the flu? Seems like an overkill to me. I don't sleep in a tent in the wilderness, I live a medium sized city in Europe and I'd wager there's more people who don't get any sort of seasonal shots than people who do. Everything works just fine.