Former felons who successfully complete their probation or parole should have their right to vote restored. Being denied the right to vote is not a deterrent to crime. Having the right to vote restored can help an ex-con feel like they are part of society, which is likely to somewhat reduce the chance of committing another crime. Also, some crimes, particularly drug laws, are an attack on people holding certain world views, in other words, they are largely thought crimes or political crimes. A legitimate democracy (democratic republic) does not disenfranchise people for holding an unpopular worldview.