[mavelikara]

>Why should that obligation be proportional (or progressively proportional) to the wealth you have and not to the resources you use (or wealth you have in that country).

This is analogous to asking why should software be priced on value delivered, vs priced on costs incurred in producing. Value pricing is much more common.

The value you derive from living in the country of your residence is higher that your poorer neighbors; hence you are charged more.