It may seem pointless, but it may be administratively simpler. Similar to how people with government jobs still pay taxes, even though their paychecks come from the government in the first place.
People with fed jobs are not so simple. Are they married, does the partner work outside the fed gov., do they have a second job, etc. But I suppose in principle you could pay them net and make adjustments at tax time. It’s okay by me.
>Negative taxes are better. No need to give to the wealthy in the first place to come back and tax them later.
It's simpler just to give every citizen the same amount of money than to have to deal with all the edge cases of people having different income this year (and needing the money immediately) versus last year. If you get hit by a bus on January 1st, I'd hope that the money was available for you right away, not in another year.
Additionally, I'd like to see a "rolling average" approach to taxation. I think it's enormously unfair that someone who has a one time event (like making a million dollar commission on a sale they worked on for five years) is taxed massively more, and misses out on many more tax credits, than someone who makes $200K a year for five years.