WAR ON MEN: Merrill Lynch manager became janitor after mistaken ID in child sex probe.

A Long Island man says he went from being a Merrill Lynch manager to a shattered school janitor after the feds — in a terrible case of mistaken identity — arrested him at work and threatened to ship him off to Mexico to face charges that he had sex with minors.

Philip Simone, a married dad from New Hyde Park, is suing the government in Brooklyn federal court for $2.75 million, claiming his life went to pot after they wrongly busted him for being a child molester.

The one sentence that tells all about today’s justice system: “They told me I had a week to prove my innocence.”