And let's see what we have: "A BI breaks with a fundamental principle of the welfare state. This, wrote Beveridge in 1942, is "to make and keep men fit for service.*" One function of the welfare state is to ensure that capital gets a big supply of labour, by making eligibity for unemployment benefit conditional upon seeking work. BI, however, breaks this principle.In its pure form, it allows folk to laze on the beach all day."
Okey dokey now. The welfare state is a product of the voters, not the result of one particular report in the 1940s in the United Kingdom. I can quite assure you that the voters were not interested in "providing labour to capital". They were interested in being compassionate to their fellow man, just as they were in the States. The welfare state is a lot bigger than wartime England. If anything, the modern welfare nation has its roots in the late Victorian period, as large groups of people realized that they were being significantly mistreated by the system.
This is an important point, because if you miss it you miss the rest of it. The social safety net, as most voters understand it, is to provide a lift up to those in need, and some sort of permanent assistance to those who are incapable of leaving their present circumstances. This means that any welfare state has as its primary mission the determination of the difference between those who are temporarily downtrodden and those who will not work, either because of physical or attitudinal reasons. Voters feel differently about these different groups of people. Therefore the policies towards them are different.
"capitalists, who want a large labour supply" -- no, capitalists want to trade stuff. Sometimes, like in the 1800s, this required a large labour supply busy as beavers in the sweat shop making widgets. Sometimes nowadays it might involve really expensive robots and 5 laborers. Or 3 web programmers and some space on AWS. These old ideas of capital and labor are dead. Please let them rest in peace without digging them up so often.
Minimum wages and basic income policies all do the same thing -- raise the floor at which most folks can enter into productive trade with others. This raises prices and increases unemployment. These kinds of ideas sound great. Who wouldn't want $25 per hour wages and guaranteed income for all? But all you'd end up with is $15 hamburgers and $34 gasoline. You don't do anything but raise the table stakes for people, like certain homeless, just don't want to participate in society. It increases poverty and suffering. Counter-intuitively, it does not make things better.
People need to pay special attention to those ideas which produce an emotional gut-feeling of "hell yeah! Why haven't we done that?" There's usually a really good reason that does not involve economic theories from the 1890s.