I heard the conspiracy theory that Russians oppose global warming because they want it to warm, they have all that land that is a frozen mess.
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They also sell a lot of carbon producing fossil fuels.
However, along your line of reasoning, I’d like to see scientists come up with an optimum temperature for the Earth. I bet it would be warmer than it is now.
Before the Himalayas formed (raising carbon dioxide removal via weathering) and South America separated from Antarctica (allowing circum-polar currents to form that trapped cold air around that continent), the world’s average temperature is thought to be 10° to 15°F warmer than today.
When you take Antarctica into account, the world’s average temp is around 50°F.
If we didn’t have that literal cold sink, we’d have no ice at the poles and a much warmer world.
This is why the “OMG, the oceans will rise!” mantra is so tragic-comic - because of our archeologically abnormally low ocean levels.