And then he suddenly decides to become a rapist
That's a totally bogus argument. Nobody decides to become a rapist, or murderer, etc. Not in the sense of having made some rational, well-thought out decision. If that were the case, there would hardly be any murders or rapes to begin with. But if you want to play that game, you can equally well make the opposite argument: Since he was in the media recently over the leaks, he saw his chance to rape someone and get away with it, because people like you would surely believe he must be innocent. (And no, I don't believe that, because I'm not a moron who thinks rapists are acting rationally)
If he's guilty, then the timing means nothing. In fact, the better timing would be before the documents had been leaked. Afterwards, what is the point of discrediting him?
The leaks do not depend on his crediblity, he's not the source. (which is the big hole in this conspiracy theory) Everyone knows smearing him won't stop Wikileaks, including the CIA. So what would the point even be? They can apparently manipulate foreign prosecutors and citizens, but are also too dumb to realize that it wouldn't achieve their goal?
No it's not a coincidence, in the sense that he was in the media, and was being asked around to give talks and whatnot and meet with possible allies (i.e. the Pirate Party in Sweden) and during that, he met these women. One of whom is (allegedly) a member of the Swedish Social Democratic party. So what's her motive then? We're talking about the party of Olof Palme, here, the party who spent most of the last 50 years being a giant pain in the USA's ass over foreign policy. Hell, when Assange was born in 1971, the US had broken off diplomatic relations with Sweden over their harsh criticism of the Vietnam War.
Out of all the countries he's going around visiting, you think Sweden is the one most likely to collaborate with the CIA? And their 'socialist' party, at that? This is typical conspiracy theory thinking. You have zero evidence that the CIA or whoever did this. All you have is a coincidence. And coincidences do happen. Just because a set of events may or may not benefit someone, doesn't mean the were behind it. Shit happens.