Hayek's main argument was that a society based on autonomous individuals, rather than collectivist groups, is more likely if everyone is guaranteed at least a minimum safety net, because otherwise people are forced to cling to birth-related groups (ethnic groups, clans, clannish religious groups, etc.) for their safety net. A short snippet: http://www.kmjn.org/snippets/hayek79_minimumincome.html
Elsewhere he discusses it in relation to choice as well: above a subsistence floor, he opposes much government intervention because he thinks markets made up of individuals making free choices can make decisions better. But below that floor, when people are desperate, you have things that are closer to "I'm going to make you an offer you can't refuse" than an economy driven by free choices. It's unclear from my memory if his worry there is primarily an ethical one, or relating to proper functioning of markets, though it could be both.
BTW, it's not being means-based that causes the existing system to have perverse incentives; the NIT is also means-based by definition. The difference is mathematical: whether the subsidy is a step function of income, or a linear function. Step-function subsidies always create perverse incentives. Unfortunately, they are ubiquitous. I dream of the day when our legislators have sufficient mathematical ability and understanding to select appropriate linear functions instead.
Anyway, I came across a paper explaining why the NIT is a non-starter, politically, in the US. The basic problem seems to be that there are too many people -- especially young single men -- who currently receive no subsidy yet would be entitled to one under the NIT. This group would make the program too expensive.
As long as it's implemented in a way that there is still an incentive to make more money, I think it could be a decent solution to our problems.
Earners are driven by envy and competition.
https://fairtaxer.files.wordpress.com/2011/11/prebate-chart-...
We still have 3 people for each open job in the country. That number may never get to parity again; the faster we can get those who cannot do anything out of the labor force, and onto a society-provided income, the better. There'll be less competition for the remaining jobs, and these people will not have to live lives of constant degradation.
If this is the road to guaranteed income, so be it. We need to get there one way or another.
More on Zero Marginal Product workers:
http://marginalrevolution.com/marginalrevolution/2010/07/zer...
http://marginalrevolution.com/marginalrevolution/2012/02/the...