Are mandatory vaccinations good or bad for us?

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Metallicube said:

 Better to let your immune system work itself and do its own thing. It's like George Carlin says, your immune system needs germs to practice on.

There's plenty of germs out there to "practice on" without risking diseases like Measles, Polio, etc

I have a incredibly strong immune system (probably from playing around with a lot of dirt and stuff when I was a kid) and I've had tons of vaccines; MMR, DTP, Hep B, Polio...