It’s not charity if everyone gets it, it’s levelling the field and making society fairer.
For the people who need it most it could mean life or death or being able to stay in their home or not have to choose between heat or food.
For those in the middle it might be a nice excuse to treat yourself.
For the richest it would be such an absurdly tiny amount of money they might not be able to spend it.
All we should care about is making sure as many people in the first group get the support. For basic income payments the most effective way to do that is to give it to everyone. By the government giving you that money instead of doing what I talked about above, more people were helped.
Also has the added bonus of countering slightly the siphoning of wealth from the poor to the rich that’s been happening the past while.