It is not the vaccine itself that's the primary issue, it's who gets to decide. Clearly your experience leads you in one direction, and that's your right. But it's also the right of the next parent to decide for her own child without signing paperwork explaining why.
And I'm concerned that so many people don't understand that if you say "no thanks", you don't have to do it.
It kind of makes the word "mandatory" a mockery.