There is no such thing as an entirely safe medication whether it is a vaccination, pill, potion or other treatment. Every medication is a poison. That is why we take it, in order to 'poison' or 'cure' a serious medical problem.
Look at the length of the piece of paper tucked into every packet of pills, listing all the potential side effects. Each of us has to make our decision on whether we should take the pill or have the vaccination.
I take anti-travel sickness pills, even though the smallest dose knocks me out for 24 hours and leaves me non-functional. I have a sticker on all my medical records saying I am allergic to pennicillin because it could kill me.
For those who suffer the 1: 1,000, 1:10,000, 1 : 1 million side effects, one can only offer sympathy and compassion. But for each on eof them, hundreds, thousands, millions, even billions are protected from diseases that could kill them or disable them.
Small pox has been eradicated and polio may soon follow suit.