Precaution or Paranoia?

"H1N1 vaccinations rolled out in UK"
http://www.cnn.com/2009/HEALTH/10/21/H1n1.flu.vaccinations/index.html

I have yet to decide whether this health plan is a great measure of precaution or an overactive bout of paranoia. Regardless, the UK is rolling out a plan to have every citizen receive the H1N1 vaccine, with priority groups receiving the shot first. Priority groups include health and social care workers, pregnant women, those over the age of 65, and those with asthma or cancer. I do know one thing, that having health and social care workers vaccinated definitely makes sense. How can an illness be prevented from spreading when those working to cure ill patients become ill themselves? Having everyone vaccinated...I do not know how I feel about this. Is the swine flu really that detrimental to strong, healthy human beings? Is this taking too much precaution? Is there such thing as too much precaution? Sometimes I wonder if as humans we should just naturally build up immunity towards germs, at least those we know will not kill us, rather than manufacturing preventive measures. Our naturally equipped immune systems have kept us around for this many years so far after all, why not let them do their job and invest resources in cures for more deadly diseases?