what about the inflation aspect of printing money to support an ubi?
I think it's best if you look at UBI as a near future sci-fi topic that you can start talking about now. Say it's the year 2050, humanity has survived or adjusted to global warming, but a combination of AI, automation, and robotics has improved enough that there is simply no longer any work for 30-50% of the population. Yet because of this automation we can still produce all the material goods society needs for a comfortable living. Do the wealthy/employed say **** you I got mine to the mass of unemployed people and accept an insane amount of homelessness and massive tent cities, or do you adjust the economy so that everyone gets a guaranteed income to afford a basic living standard?
And before you start thinking everyone would just be lazy bums, consider how many 'careers' people try to pursue but have to settle for a day job because for the vast majority interested they can give it full a time commitment just no money in it to earn a living: musicians, film & TV actors, artists, streamers and podcasters, indy game developers, various fitness instructors, make up artists, photographers, etc etc.
The way work is now isn't the way it's always been or has to be. I would say it's basically a creation of post-WWII prosperity mixed with Reaganomics greed.