As is my custom, when multiple women with nothing to gain and no axe to grind come forward, my assumption is to believe them for the same reason I believe multiple independent witnesses to a bank robbery: because it’s common sense.
Simcha gives plenty of room for the perp to give his side of things, which upsets some people. I think that’s like complaining Herman Wouk gave Queeg too much space for his Strawberry Speech in The Caine Mutiny. It’s precisely the point. The more the guy talks, the more I believe his victims.