England already has Sharia courts.
This is technically true but grossly misleading: England also already has Jewish courts. They have exactly the same standing, which is they have no standing in law. They operate purely where the plaintiffs agree to abide by their judgement. Really, they are no different from say two people going to a mutual friend and asking the friend to adjudicate on a disagreement.
At its core, the anti-vax movement is bad risk assessment for a few reasons. First of all, the horrors of the diseases that most vaccinations prevent against haven't been seen in a few generations. People my age (30's) with kids have never lived in a world where you could get polio or mumps at any moment and wind up dead, on an iron lung, deaf, scarred for life, etc..
That's right, people of your age never lived in a world where you could get polio or mumps at any moment. People of my age (55) have, so my experience might be a bit better than yours. I've had measles, I've had mumps, I've had chickenpox. So did all my friends. My wife (48) had all those and she had whooping cough, and so did several of her classmates. No big deal. Neither she nor I know anyone who were scarred for life, etc. Maybe we are both statistical anomolies, or maybe it just wasn't as bad as you seem to believe. I'm not suggesting it was perfect; but it just wasn't that way.
Because of the effectiveness of widespread childhood vaccination, we've had at least a generation of people with minimal firsthand exposure to all the wacky pathogenic fun that used to be quite common.
Indeed. BTW, how old are you. I'm 55, I've had measles, I've had chicken pox, I've had mumps, I've very likely had rubella. My wife is 48. She's had all those, she's had whooping cough. No big deal, and neither of us can remember "all the wacky pathogenic fun". In 1988, when MMR was introduced in the UK (measles vaccine had been around a while but take up was patchy) there were 16 deaths (http://www.hpa.org.uk/web/HPAweb&HPAwebStandard/HPAweb_C/1195733811885): since measles was endemic and virtually all kids would get it, that would be 16 deaths in around 600000. Not nice, but absolutely awful either. So vaccines may be good (broadly, I agree); vaccine *policy* may be good (broadly, I disagree); but most of the things vaccinated against were not the mass killers/mass complications that the pro-vaccine people would have others believe.
"The chain which can be yanked is not the eternal chain." -- G. Fitch