I am afraid UBI completely ignores the human psyche produced by millions of years of evolution. We have evolved to conserve our energy and do the least amount of work necessary. In general, motivation comes in two flavors: carrot and stick. But it seems that in general population, stick is a much more prevalent form of motivation.

Thus if you give people UBI, you rob them of the most basic motivation to get out there and improve themselves. I am sure if I had UBI when I was young I would've stayed at my parents', smoking weed, jerking off and playing computer games all they. The fact that I couldn't afford these things made me go out, get a job and educate myself towards making something out of my life.

So, am I wrong? I hope so. I really want UBI to succeed, it seems like such a wonderful idea. But so did communism and we know how that turned out...