I didn't really make any wild assumptions. Your explanation on the other hand is basically "it's Russia, because I don't like Russia" (without really acknowledging that there is no single "Russia" that kills ex-spies and invades Danish waters: there are multiple different people and agencies, with different intentions and modes of operation) which is exactly what would anybody trying to set up "Russia" (or anybody) would want. So, I don't think "Occam's razor" applies to either yours or my reasoning, it rather seems to me that people who are exceedingly eager to take at face value stories like that exhibit what is called "magical thinking".
P.S. I want to clarify, that I don't really blame CIA, it was just a way of simplifying the essence of what I'm trying to convey. I don't try to make any theories of what's happening, I'm acknowledging that I have no clue, because what I'm seeing is 2 political sides pointing at each other, shouting and swinging arms. All that I'm saying is that accepting "the simplest explanation because of Occam'z razon" here is stupid, because (unlike when setting up a physics experiment) the simplest explanation here is just words and pointing sides, the same as the more complex explanation, and I can think of dozens of "possible explanations" that all will be lies. So I don't pretend to know who poisoned Navalny (or even if he was poisoned, for that matter), but it would be baffling to me if it indeed was done under direct or indirect Putin's orders. So, I was only telling the GP that he is not alone in thinking this seems very suspicious. Indeed it does.