Russia has motive, means, and opportunity. It's not an insane conclusion to draw, and it's entirely possible the decision to blame them is based on non-public information like travel records, surveillance data, etc.
So do many other groups.
... it's entirely possible the decision to blame them is based on non-public information like travel records, surveillance data, etc.
Based on the information released to date, it's also possible that the decision is a naked attempt to manipulate the public.
I'd like to think that people would have become more skeptical of their government's use of "intelligence." Sadly, that doesn't seem to be the case.
Most of them aren't doing this, though.
https://www.theguardian.com/world/2018/mar/09/russian-state-...
> Russian state television has warned “traitors” and Kremlin critics that they should not settle in England because of an increased risk of dying in mysterious circumstances.