Actually I'm not against UBI, but I don't think that the martians argument about the money system was a good one: the current system is just much civilized than anything that existed before as far as I can tell.

UBI may be part of the next evolutionary step of society, we'll see, but I'm slightly bothered that it relies on the comfort and the wealthiness of the "first world" built to the detriment of the "third world". I personally feel that "people should be allowed to live" would be more convincing to me if it was about worldwide inequality rather than UBI in westerner society.