I advocate and support UBI in the form of negative income tax, where the marginal rate tends towards the flat rate as you progress up the income scale. I don't support flat tax in isolation of wider taxation and benefit reform. I certainly do not advocate removal of safety nets or support. Rather, I advocate an integrated tax and benefit setup, without arbitrary discrimination, random qualification criteria or punishing sanctions. You're essentially advocating that discrimination is ok if you believe it has a positive effect, the problem with that view is its the same view held by everyone who advocates arbitrary discrimination of every kind.