Not that I disagree with what you just said, but here that is less of an issue as we spend a lot of resources to help elevate these people and make sure they have everything they need throughout life and it has worked out well for us as mainly focusing on lowering taxes in comparison has largely shown to be less beneficial as people often make bad financial decisions.
But now that the wast majority of transactions(at least here) are done electronically I'd like to see flat taxes like the sale tax be adjusted depending on income, but I don't think there is much interest in such ideas yet, at least I can't remember ever hearing any officials talking about it.