Why not, if the only other alternative available to you is $0/hour and you don't lose any of your basic income?
Two reasons: 1) You have reduced their incentive to work and 2) Most of them are getting UBI because they physically or mentally cannot work anyway.
By the numbers:
Today welfare tops out at about $7k/year, and minimum wage is $7.25 an hour which is about $15k. Using your numbers, UBI would be at least $16k for a single person, and they will make $1/hour which is $2k. So you have reduced their wage by a factor of 7 and increased their welfare by a factor of 2. That means that they have a 14-fold reduction in the benefit of their work.
So make a deposit to a debit account each day, they will eventually figure it out. What you are saying is 10% of US population is mentally incompetent. If that is truly the case, we have a public health emergency. But I bet it's closer to 1% if we give people reasonable chances to be independent.
We *do* have a public health emergency! 66% of people below the poverty line report substance abuse or mental health problems! You need to go meet the poor because it is clear you know jack about poverty in America. It's okay, I didn't either until my brother-in-law and my father, both got involved in careers in that field.
Your "guess" that they will "eventually figure it out" does not jive with reality. America cannot make a policy change based on the middle-class's guess as to how impoverished people will respond to a sudden influx of cash. I suggest that you volunteer at a soup kitchen for a week, or volunteer to drive some impoverished people around town. Maybe ride the bus to work in Chicago or DC and talk to them. Go meet a social worker. Your idea of what their life is like is far from reality.
These ideas sound nice in theory - it's the libertarian capitalist "get the government out of their way" viewpoint. It's appealing because we hate bureaucracy. I lean libertarian myself as well. But your confidence in people's ability to make good decisions does not reflect the reality that psychologists and social workers know. Many of the poor don't know how to budget. They get scammed. Many are elderly, or have never had a savings account before. Some of them wouldn't walk into a bank at gunpoint! They are scared of banks and signatures, so they go to check cashing services that take 20% off the top. They keep money in cash in their houses, and lose track of it or get robbed. You are saying that by getting rid of all this structure, and handing them cash, they will suddenly save themselves.
I don't understand the last 4 paragraphs of your response so I can't reply regarding the taxation stuff.