> their abysmal greed and asocial psyche: When you already have billions, what does it matter if you pay any percentage in taxes? How does it have any material or imaterial impact on your quality of life if you contribute back to society a fraction of what it gifted you with?

I don't think welfare should be based on philanthropy, but I do think some billionaires are still philanthropic, e.g. Bill Gates.

I think there is also the situation where these tax arrangements arise out of a lack of thought, rather than conscious greed and asociality.

If you pay a team of accountants and say "save me money", they're going to do everything possible to minimise your tax, some methods which should be classed as tax evasion, not avoidance.

I don't expect billionaires to have a conscience. I vote for our system to stop damage from people acting without a conscience.