Why is that aspect very controversial? It's not like Warren Buffett would suddenly not be paying tons of taxes. $1k/month is dwarfed by the taxes he pays.
Because people are often afraid enough of the "wrong people" getting things they don't deserve that they are willing to accept the right people not getting things they do deserve to prevent it. ("deserve" here being relative to the value system of the person whose opinion is at issue, to be clear.)
