You are, of course, allowed the opinion that people with muliple piercings are 'a bit daft', as long as you wouldn't mind if someone held the same opinion of you based on the shirt you are wearing. Every thing about even the most 'natural' (by which I assume you mean appropriately heterogeneous as befitting a society's majority standards, rather than butt naked with uncut hair, our real 'natural' state) of looks has been chosen to reflect that individual's tastes; every single thing has been a 'choice'. By ascribing a particular character, attitude or mode of behaviour to piercings or any other aspect of appearance you're only inviting snap, often wildly inaccurate, judgements to flourish unchecked.