So far as I can see, there's nothing in principle implausible about Strauss-Kahn being guilty, and there's nothing in principle implausible about this being a conspiracy either. It all depends on information we haven't as yet got.

What is less plausible is the assumption in the thread heading, and in the original post, that any conspiracy would be likely to be on the part of the American authorities. I agree with kendall in thinking the heading needs changing.
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"...the non-Americans on Mudcat seem to be much more open to conspiracy theories in general than US posters do."

I'd see that as highly questionable. The daftest conspiracy theories seem to flourish in the USA, where polls seem to indicate that an extraordinarily high proportion of people believe, for example, that no one ever landed on the Moon, that their current president is a foreigner, or their last president was responsible for 9/11.

Perhaps Europeans are more liable to assume that as a matter of routine our leaders lie to us. After all, when the records come out a few years later it always seems to be revealed that they did.

Anyway, if Strauss-Kahn is a serial rapist, and this has been hushed up, that is a conspiracy theory too.