"Overall basic income is theft from workers and will be seen as such by those workers."
When enough of those producing wealth decide that UBI = theft, they aren't going to just continue producing without pushing back. Personally, if UBI is implemented, I will "go Galt" and move to a self-sufficient homesteading-style life, leaving any cash-requiring activities (like paying taxes) to my $UBI/mo check. That I am a productive person does not mean my productivity will necessarily be taxable; I grew up in a live-off-the-land family, and would be happy to return to that lifestyle if you're going to just take a big chunk of my income just to give to others.
There are enough jobs (yes, there are). Wealth is not durable (you eat a hamburger, $1 of economic wealth turns to *). Encouraging idleness by funding it is an unsustainable economic strategy, because so many people find paid idleness a desirable lifestyle.
You're close, and it's an easy mistake to make since it seems intuitive. However, the reality is that people find THE IDEA of paid idleness desirable. Small N, but everyone I know who has found themselves in that position has only remained idle for a very short time. Productivity quickly returns, although not in the form of trading time for money.
Like most human traits, there is a wide degree of variance. As such there is no doubt in my mind UBI would allow a greater number of idlers because it would be more easily available. Just as it would allow more people to trade a job they don't like for a constructive activity they do.
(I'm not saying that about all poor, but the fraction thereof who are is significant.)
Disagree, basic income is equitable distribution of a collective legacy of increasingly advanced tools and a necessary recognition of limited natural resources and duty to share a small portion to every human being on the basis of birth into our society, aka social contract.