Those programs can get really costly in states with low economic growth and high poverty rates. The idea that we should just give poor people money instead of funding huge government programs (often with no metric for success beyond "number of people enrolled") would play well in many red states.
http://www.nytimes.com/2006/11/23/business/23scene.html?_r=0
It seems that any tax plan that is remotely progressive is immediately labeled as "socialist" by the right.
Just back-of-the envelope numbers, if 300 million Americans received $30k/yr, that's $9 trillion dollars per year that has to come from someplace. My guess would be that the majority of people would end up handing that $30k right back in the form of taxes. And at that point, it becomes an exercise in the government giving people money, then having to get it back via taxes, so then what is the point? Is it easier to give 10 people $10 or to give 100 people $10, then take $900 of it back?
If 100 people is the totality of the population, the cost of bureaucracy for monitoring which of those 10 people actually get the $10 (specifically ensuring a low fraud level) is near or greater than $100, and the social stigma of getting that $10 in the first place is reduced or eliminated, then yes, it could be "easier".
In other words, would it make sense to give everyone the same amount, and take it back from some in taxes, when weighing the cost of the current levels of enforcement and the possible social good done through reduced stigmatization of the poor.
I'm not sure how'd you account for different costs of living in different areas. But I think the number would be closer to $20k.
Also, it could just be an untaxed amount, no need to muddy things up with that.
It's still a big chunk of money: $4-5T. But You could cancel out a lot of existing services if this was implemented. We're spending $1.2T for pensions ands $0.5T for welfare [1], so some of that could go towards this. But yeah, that's still a lot of money. Not sure where it'd come from. Maybe start with a low amount and scale upwards, hoping to reap some economic benefits from the improvements?
If anything this is the pure form of the mixed capitalism/democratic economy/government model that every Western nation already has.
BI is a way of reconciling capitalism with the "post-work" work world we are moving into.
Its true that BI is consistent with that mix, but that's not a counterargument to it being from the socialist side of the capitalist/socialist divide. (Of course, the utility of that divide and the breakdown of arguments over economic arrangements into "which side of the divide does that fall into?" followed by "if capitalist, good; if socialist, bad", or vice-versa, is dubious.)
People take into account today's income and capital gains revenues, and assume that they can safely increase those rates by a wide margin causing no change in underlying behavior.
In reality a top-income earner who made eight digits or above can safely take the next 2-3 years off without driving his family into the soup kitchen situation, and as far as capital gains goes, people become more cognizant of harvesting capital losses before they sell anything that appreciated in value (or simply sell a smaller chunk of their assets, if we're talking highly liquid investments).