A registered sex offender ignited fury at Fresno City Hall Thursday after showing up to rail against new rules that could shut him — and others like him — out of local government for good.Rene Campos, whose brief City Council run fizzled after he failed to gather the 20 signatures needed to make the ballot, insisted he’s being unfairly targeted and begged officials not to block registered sex offenders from attending meetings or running for office.Campos, 41, has been on