If someone simply asked what are the advantages of bees barbed stingers over wasps non barbed ones, that would be an interesting question. But if someone asks “why” and then proceeds to give a circular logic explanation (it survived because it is fit because it survived) that is unprovable, I find that to be silly idle speculation.

I believe you’d have to look at the evolutionary advantage of bees with barbed stingers vs bees without barbed stingers and how one made that particular group of bees more successful than the other.