Earlier quoted context omitted.
You might have a point if any of the other people you mention had maintained unchallenged political power for 2 decades by the expedient of murdering their political rivals.
I am just pointing out that if you use these terms, it frames the whole country in a negative sense. Would Bush's USA, Clinton's USA, Nixon's USA, Obama's USA or POTUS X' USA work better? Because each one of the US presidents except Trump and Biden (give him some more time) is directly or indirectly responsible for more killing around the world than Putin would ever be. Hundreds of thousands (in case of some presiden…
And while you could certainly argue that for example Bush plunged his country into an unnecessary war to feed his pride, you're arguing that he's not that much of a break from his predecessors. And the American people as a whole definitely carry more of that responsibility. That's still a reason to call out Putin specifically, instead of the country as a whole.