The ability to restrict something doesn't imply it's ideal to restrict that thing. Some people should use more CO2, just like some people should go to space, or some people should be lawyer.
The idea that some people will use more of a resource than another doesn't imply it's ideal to have no limit whatsoever on its usage either though; there might be some amount of CO2 that's unreasonable for a single person to use, just like having different professions being useful doesn't mean that every possible profession (like murder for hire) should be allowed.
Sure, but it's important to put that in the context of the vast majority of the world's population who never fly, me who flies maybe three times a year, and people who flight weekly or more for the purpose of entertainment or a luxury lifestyle.
Make it progressively more expensive to fly more miles to moderate the excesses; offer tax breaks where it is beneficial for the entire community.
This can be adapted into different scenarios or use cases. At least it could be the first action into the CO2 emission problem that everybody is complaining about but nobody really does a thing. Well, also maybe we can let Kim Kardashian to have Zoom calls rather than taking flights.