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Barring an active epidemic, a person should be allowed to refuse vaccination for themselves and those they are responsible for and to not be punished by society.
The way vaccines work is mainly through herd immunity. No vaccine is 100% effective, but if the people around someone who is infected are vaccinated, the chance of it spreading to others is minimized. This is what stops epidemics before they happen.
Humans are still evolving
We, as a species, have evolved naturally. To our knowledge nothing can stop evolution, and thus we must still be evolving.
We have too much reverence for dead bodies
A dead body cannot defend itself. There is a reason why you cannot prosecute a dead man.
Scientific hypotheses can not be proven
The scientific method cannot guarantee it holding true. For example, we believe the physical laws of the universe are constant because the scientific method has proved it so. But that does not mean that they cannot change, however unlikely. What guarantees are made we are not living in the Matrix?
The voting age should be lower than 18 in Canada
The youth vote is significantly lower than the senior vote. Allowing more youths to vote would not do much democratically. In the 2011 election 18-24 had ~39% turnout compared to 45-74 with ~70%.
Sharia law should be banned from democratic countries
The point of a democracy is to vote on the subject. A democratic country may vote to enact Sharia law, or not to. It is up to the people. All "moderate" muslim countries with partial/full democracies don't fully enact sharia law and are unlikely to, even with majority muslim rule.