Currently people decide how much work they are willing to do - want more stuff, earn more money to buy more stuff
We are already seeing the disaster of Social Security benefits not being enough to fund retirement - how will this work when people don’t even work to save for retirement
If it's enough to enable you to do what you want without working, then it's enough. If it's not you find a way to get more.
There are a lot of problems with people in tough situations where their outcomes are made worse by having to make bad choices. People accept abusive living or working situations, suffer through anxieties and trauma because it's a choice between an awful situation and going hungry and homeless. A whole lot of people are wage slaves. The "option" of working, where to work, and to accept situations is only an illusion because the alternative is much worse.
Give people UBI instead of difficult to navigate social programs which don't guarantee support and you have to be an expert to navigate well and you solve a lot of problems.
People living on the street are expensive to society and not in some abstract way. People have less lifetime value to society because they are forced to accept their current situation and don't have the resources to have job mobility or can't afford to put themselves in a better living situation. People also treat jobs like they are forced to do them. A workforce that is there by choice performs a lot better, gets treated a lot better, and has better outcomes for customers, employees, and in general everyone.
Social security wasn't meant to fund retirement, it's a safety net to prevent the elderly who can no longer reasonably work from pushing way past their limits or starving. It wasn't meant to fund your expensive suburb lifestyle. It isn't luxury, but indeed you can live off of social security but it requires choices that lots of people don't want to make.
This petition is explicitly about giving everyone a middle class lifestyle for no contributions.
People are quite content at middle class lifestyle.
We're not talking "struggling artist" here, we're talking "yeah, I'm doing quite well. Haven't quite decided what my book will be about yet, though".
Like the parent comment said, we're already failing at funding social security even with the classical age pyramid (which is disappearing, by the way), and now we want to expand that to not just seniors but EVERYONE?
It's just completely unworkable.
For the other things you mention, yes we do have a bunch of social problems. UBI is not the answer, or at least isn't the answer in the form this petition asks for. Two things are ridiculous: the "U" in UBI stands for zero means-testing, and in this petition made explicit again. The second is that middle-class is just way too high to aim for.
I'm in favour of more spending on the poor and homeless, even when it's not "fair". I'm even for less "punishment" and more "rehabilitation" for crimes, even when it's not "fair". Society is better off if (hyperbole alert here) criminals are rewarded for their crimes by getting education and support, than if they're stomped on.
But the idea of UBI (as proposed here) is broken on every level, with society-ending first and second order effects.
People add value to society because they get "social credits" (aka money), that they can then use to better their own lives or their causes.
If you remove that aspect then people will do what they want, not what needs to be done or is valued.
