To be fair,any public figure is going to draw accusations. There's crazy people, fans, stalkers, and others out for revenge. I could understand accusations coming out in a flood because some people want the attention it brings.
That being said, Spacey certainly isn't clean. Too many accusations and too much corroborating statements to just sweep under the rug. Whether he's ever actually convicted in court is doubtful, but his career is done and we need to stop giving him attention. Consign him to the graveyard of terrible people and ostracize him.