"it's a sign that the laws didn't think everything through - as well as focusing on who you want a law to apply to you need to consider who you don't want it to apply to and draft it accordingly"
And therein lies the problem. The law is a clumsy thing. That;s why almost any statute law is amended and defined by years of case law (i.e. courts' definitions). Statute law is made by parliamentarians, sometimes in response to events and often with a view to populist reaction and possible re-election. Sadly, IME, laws are often ill-conceived and not thought through.
I don't know what the answer is - I just raise the problems.
I remember conversations I had with my son when he was 18ish and heading out for a night on the town. Clubs door control should, of course, have ensured that all patrons were 18 (haha!). I explained to him that in theory if he met a girl celebrating her 16th birthday the course of his life could be altered depending on what took place before, and what took place after, midnight.
Bringing this back to JWs - would a 21 yearold MS/elder be considered to be in a 'position of authority' over a naieve 17 yearold 'sister', I wonder? Arguments for and against, I suppose.