With UBI, it doesn't mean there aren't any jobs at all. It means that you need to incentivise people with enough money that they actually want to do that job. Better than the alternative of paying someone a poverty wage so they can try to keep a roof over their head.

The way things are sucks, so maybe we should roll the dice then.

so effectively what we want is a society that brutalises and marginalises a certain community to ensure there is a stream of desperate people to take "those" jobs?

Just heard someone who exactly wants to do that.

Are you kidding? That's literally one of the most famous volunteer task. There's more than half a million volunteer water rescue personnel in Germany alone. Granted, they're not only life guarding, but that's a big part of what they do. Not at pools (those are usually run for profit, so they can and should pay personnel for that) but at lakes and the sea.