Sure, we can make a moral argument about that. But that's not what this branch of the debate is about. We were debating the proposition that "money itself tends to disincentivise work for a lot of people" and employment is force.

But since you bring it up, my biggest concern about BI is along the same lines as your moral question. Suppose that every year we hand out $X,000 to each person. Some people are going to waste that on booze, gambling, etc., and still be left with nothing to eat. What's our moral obligation to those people?