Exactly, Russian secret service were either dumb to do it in such obvious way or just wanted to send a message to other spies. There are plenty of unexplained British and US spy deaths.
'His decomposing naked remains were found in a red The North Face bag, padlocked from the outside, in the bath of the main bedroom's en-suite bathroom.'
...
'A subsequent Metropolitan Police re-investigation concluded that Williams's death was "probably an accident."'
If you want to send a message, you don't make it a plausible accident. And if you really want to send a message loud and clear, you let it be understood that this was no rogue element; the whole government backs this up: another branch of the executive, the judiciary (no review), and the legislative (no investigative committee).
However, surely if he was killed to order, the people responsible would make it far less obvious, and if it was attempted to be covered up - surely it wouldn't be as poorly done as this?
I can see the use of killing someone with a painful, elongated death by polonium poisoning, it's obvious, and makes a statement.
I don't feel the same can be said for making the body of someone appear in a locked bag though - people's reactions are closer to "WTF?" rather than shock.
If it weren't so awful, the Met's verdict after their investigation into Williams' death is almost comical - sort of like Occam's Razor taken to some sort of incredible extreme. I mean, of course he accidentally padlocked himself into a bag and died - happens every day, right?
...
'A subsequent Metropolitan Police re-investigation concluded that Williams's death was "probably an accident."'
... what?