Thesis A universal basic income would make people freer, not lazier
Where it stands
Philippe Van Parijs, in Real Freedom for All (1995), argues that a just society should maximise everyone's real freedom to do whatever they might want to do, and that an unconditional basic income is the best way to do it.
Republicans in Philip Pettit's sense add another argument: a basic income gives people an exit option, so they're no longer dominated by bosses, landlords or partners they can't afford to leave.
On the empirical side, Finland's 2017–2018 experiment found small effects on employment but clear improvements in well-being and trust.
The classic objection is reciprocity. Rawls once remarked that those who surf all day off Malibu shouldn't be supported by public funds. I'll argue that the freedom argument outweighs it.