The per capita argument makes sense from a human perspective, even for any culture globally, as it is an appeal to fairness and equality.

However, the natural phenomena governing the planet's weather does not care about anything other than absolute CO2.

Fair or not, absolute CO2 is the number that matters for the planet.

We can come up with a mitigation or fairness mechanism, but in the end the planet works just like a virus or a script, it's a complex mechanism that you cannot negotiate or reason with.