it's kind of horrifying reading some of the anti-vaccination "evidence" put out there, and equally horrifying the number of dumbasses who believe it.
as far as I can tell, there is a legitimate debate over the efficacy of flu shots... not due to vaccinations being bad in general (the idiotic Jenny McCarthy's argument) but because they are only effective against one (1) strain of flu, and it's a bit of a guessing game on the part of the people pushing the vaccine as to whether this will be the strain most people get exposed to. also that the flu virus is capable of such rapid mutations that it could render any vaccines impotent, or ineffective.
still, the efficiency of vaccines relies on most people getting them. like polio, MMR, etc., we can almost eradicate most communicable diseases if done right and in a coordinated manner. but half-ass measures can sometimes be worse. to that extent, I have no problem in theory with government-mandated vaccinations that rest on solid scientific evidence.
if a sickness is going to affect 50% of people and kill 20% of them of them or maim them for life, but a vaccine will render it harmless, it's worth a mandated approach even if 1% or so of the population gets the sickness from the vaccine and dies. it's like shut up and deal with it. we're all better off, someone has to take the risk. sometimes your individual needs are subject to the needs of the many and that's the way it's always been