I could see probation and/or a required (and taxpayer funded) civics education course as part of a conviction; but I agree. Either the civil restitution and rehabilitation (I can dream we'll be a first world nation someday) are completed by the sentencing or the sentencing is insufficient and should be fixed in the law.

Permanent dis-enfranchisement is a way of ensuring someone remains ostracized from society and is forever given reason to work against it.