Time travel is impossible.
Since a Time Machine has yet to be created. When one does exist we may not be able to go back to a time when it didn't exist in order to not create a paradox by messing something up were we prevent it's existence.
Voter ID Laws should be enacted as a preventive measure to prevent voting fraud
We have a secret ballot. If one were to vote fraudulently how would their vote be negated from the total without discarding someone else's legitimate vote by accident? It is easier to stop a fraudulent vote from going into the pool then to fish the fraudulent vote out.