+1
The threshold for "is likely guilty" and "can be convicted" are obviously quite different. O.J. Simpson wasn't convicted, either, and they only got Al Capone on his taxes.
Ethical considerations should, I think, should only have to be based on the preponderance of the evidence and not the "reasonable doubt" threshold, since we're depriving them only of our patronage and attention and not of their basic rights. This is particularly true if the reason someone isn't convicted is, say, the statute of limitations or some other legal technicality.
In this case, Spacey has apologized and very nearly confessed, too, which makes all these considerations a lot more straightforward than if we had to judge each person's word against the other's without personal knowledge of either.