We currently DO have progressive taxation (not only in the Western world but in many other non-Western countries too).
I'm not sure where you're getting your information of "dismantled", but that is false. Anyone that has filed their taxes in the US (or other Western countries) on their own knows this.
That used to exist and was called progressive taxation. Long ago dismantled, and made to seem an outrage to ordinary people who benefitted from it.
We currently DO have progressive taxation (not only in the Western world but in many other non-Western countries too).
I'm not sure where you're getting your information of "dismantled", but that is false. Anyone that has filed their taxes in the US (or other Western countries) on their own knows this.