Earlier quoted context omitted.
I grew up near a lake in the Alps and I am quite sure that any floatation device in Europe that is not safe for leaving your kids unsupervised has a big warning sign printed on the floatatiin device itself. An exeption were these orange things you strap onto a child's arms, and inflate, which they can't really remove by themselves.
Those are called "water wings" in the US and the person you were replying to feels quite the opposite about their safety; the ones I've seen available for purchase in the states are easy to dislodge accidentally.
In general, I want people to have full market freedoms, but I put those water wings pretty near lawn darts in terms of danger.