It isn't just pissing off the Russians, its pissing off everybody. When you perform an act on foreign soil you open yourself up to scrutiny from everyone. The USA is already largely considered a warmonger state
As for whether the CIA would want Snowden dead - I presume it would only have been useful to them pre-leak, and I doubt murder would have been on the cards then anyway. I don't see retribution as being particularly high on the CIA's list of priorities, and the political entities in the US that are keeping Snowden relevant wouldn't appear to gain anything from his death.
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It isn't just pissing off the Russians, its pissing off everybody. When you perform an act on foreign soil you open yourself up to scrutiny from everyone. The USA is already largely considered a warmonger state
As for whether the CIA would want Snowden dead - I presume it would only have been useful to them pre-leak, and I doubt murder would have been on the cards then anyway. I don't see retribution as being particularly high on the CIA's list of priorities, and the political entities in the US that are keeping Snowden relevant wouldn't appear to gain anything from his death.