The Freidman NIT tax you are referring to, is intended to replace all other welfare and entitlement programs, not to supplement them.
And...
I know very well the ramifications of such a plan. It will practically eliminate all offices surrounding the broad range of social services currently provided in this regard.
So it should please those who wish to see gov't become smaller (such as yourself), even though outlays will go up.
The point being it is far more efficient and practical as a "social safety net" versus the current, inefficient manner in which such outlays are administered.
There's no need to worry about fraud or "gaming the system" since the lowest common denominator is devoid of such concerns--and that's precluding the base economic benefit previously mentioned.
Oh sure, there's room for some "under the table" money being hustled, but is that any different from the current situation? Small jobs on the side with petty remuneration does little as far as grand economic distortions are concerned (see Italian income tax receipts for an extreme example). To which, the "taxman" still has all their power to go bust those
evil leeches.
Or do you see some grand problem I'm failing to realize?