East Village residents are up in arms over Mayor Zohran Mamdani’s scheme to relocate one of the Big Apple’s most notorious homeless shelters to their neighborhood — potentially transforming it into a doormat for Gotham’s indigent, and a magnet for crime. Former clientele at the soon-to-shutter Bellevue Shelter on East 30th Street in Midtown included a slew of ex-cons and sickos, such as deranged stabber Ramon Rivera , who went on a 2.5-hour stabbing spree in Manhattan on Nov. 18, 2024, that