I'm not. I'm not saying that the US is the most responsible (though it arguably is over the last half century). That's not really relevant. Moaning that other countries did just as bad doesn't somehow let you off the hook.
The US is the most responsible country, period, when you consider the total sum of historical emissions. And when you consider current emissions (over 20% of global emissions, second highest), and per capita (around 16 tonnes per person, which is about 4x the global average), then, yeah.
This isn't even a question of reparations, what happens in the US is critical.
More carbon is just a byproduct of having more people, which is better for everyone. We need to have a bigger population in order to take our place as the rightful rulers of the galaxy.
Hate to burst your bubble, but consumption is far more important than population.
Why should the US suffer a likely republican administration, a higher GDP-to-debt ratio, and less spending on its own citizens when China which is a superpower, is the 2nd largest economy by GDP PPP and 2nd by nominal GDP gets off scot-free?
China shouldn't get off scot free. What happens in China is crucial to the climate crisis.
But if we're comparing China to the US, the US's per capita emissions are over 2x as much as China, and its historical emissions are greater. "What about China?" is just a deflection, when the US and China both have to reduce emissions, as together, they're close to around 50% of global emissions.