The mind tries to keep its innocence by placing the guilt somewhere outside itself. Washing the hands is the ego's central maneuver: to declare oneself clean while the deed goes forward, as if responsibility could be rinsed off and handed to the crowd. But guilt is not removed by projection; it is only hidden from the one who threw it, and it waits.
The water changes nothing, because innocence was never a matter of clean hands but of a mind that refuses to condemn at all. To say see ye to it is to pretend the choice belongs to someone else. Real innocence would have released the just person, not washed away the appearance of the decision to destroy him.
Water: the ego's ritual of self-cleansing, the attempt to appear guiltless while the guilt is quietly passed to others.
Multitude: the outside world the mind uses to carry the blame it will not own, the crowd onto which guilt is projected.