Oh no, they would very much be positive. You'd know that insulin would have saved every one of their lives. Even a very small does of insulin is just that good.

But these studies aren't like that. They aren't that good. UBI isn't that good. That's what I get out of these studies.

If insulin was already GA, and you gave it to people without insulin, and they believed that you’d stop giving it to them in a few months. The people would be healthy temporarily while preparing for immanent suffering. The study would likely report mixed psychological benefits. I hope the analogy makes sense.

A better UBI study would bucket people into a lifetime monthly payout (with inflation increase etc). Give them an opportunity to invest in their lives.