Earlier quoted context omitted.
Simple enough: clearing the lazy, the unmotivated, and the unaccountable from our labor market would make it easier to get work done (less drain from employees who don't contribute); make work more pleasant (surrounded by motivated colleagues who value what they do); and eliminate competition from useless employees who leech jobs, artificially inflate the labor supply and tarnish average applicant quality because the…
all of the problems you just described can be solved by simply firing a bad employee or not hiring bad ones in the first place. I'm still not following why paying them to do nothing is necessary.
If those bad employees could self select the "good enough" lifestyle provided by a basic income, we could reduce all the overheads associated with trying to protect workplaces from them.