If you got every child molester to vote, lowering the age of consent would still fail miserably.
Anyway, someone who has served their jail sentence and repaid their debt to society should be able to vote.
Can a murderer ever truly repay his debt to society?
Honestly, I probably could be brought around to supporting allowing ex-felons to vote a period of time after they are off parole, and haven't gotten into any additional trouble. That would probably be very few of them.
But I just can't see this as an issue that I should care about. I see no reason to gratuitously do something nice for criminals. They are a scourge on society, and their prison terms are rarely anywhere near long enough, in my opinion.
And I doubt too many of them care about voting anyway. Plus, if they vote, they'll vote Democratic (itself an indictment of the Democratic party). So I see no reason to support it, while there are other unresolved problems in society. This is right at the bottom of my list.