Actually - to be fair to Ryuk - I think non-sexual tranvestitism is more common than you imply.
True, it's not good though is it? And they're getting some sort of 'kick' out of it that even if not sexual as such, doesn't seem wholesome.

They should take up morris dancing instead.

Yes we all have bad habits- we should try and break them though, not think we can act however we like without consequences. Self-indulgence isn't the pinnacle of virtue as a lot of people think it to be, thinking they can 'be themselves' to the detriment of all else. It's all a balance. We all have foibles and 'vices'- a little bit of what you fancy does you good, in moderation, but there are sensible limits.