Just so everyone knows, Braineack's statistics are mostly wrong. You can look this stuff up yourself.
The pediatric (0-18 years) mortality rate from flu is certainly quite low. One in something like 800,000. But most of those are unvaccinated kids. Most of those are at-risk infants.
So, if you're gonna be around at-risk infants, it's probably a good idea. That's why medical personnel are required to get it. So that, within the hospital environment, there are fewer staff roaming around spreading flu. Generally speaking.
Also, most years for most people, the vaccine is simply quite effective. No, it does not prevent you from getting the flu. It does lower the odds that you will. If you get it every year, then over a period of, say, ten years, you can generally expect to get the flu less often.
That's a measured reality. The benefits are statistical, not absolute, but nonetheless real.
I got it when I had an infant. I don't any more because I am willing to tough out the flu in exchange for the convenience of not mucking about getting the vaccine.
ETA: roughly running the numbers, flu vaccinations seem to be saving the lives of about 100 kids (0-18 years of age) per year in the USA. That's just the first order effect of vaccinating the kids themselves. Much harder to estimate the second order effects of vaccinating nurses etc.
Still, that seems pretty worthwhile.