Appearing on MSNBC’s “Hardball†on Thursday, former New York City mayoral candidate and author Mark Green advocated for new legislation that would allow people to identify and locate gun owners who lived in their neighborhoods. He compared it to the already existing “Megan’s Law,†which lets citizens know if a convicted sex offender lives near them. Then he flat-out compared sex offenders to gun owners.“If we have a Megan’s Law — because I think almost everyone might agree — that if you’re a convicted child molester, a neighbor might want to know that because they’re in your home, safe, but...