Fair enough, but you're just going to have to trust me on this one. Personally I just ask someone the basic question "what happened" first up, let them talk while I make notes, then go through it all again, asking questions so i get all the information theyve inevitably missed. Then I stitch it all together so I get a complete account but in the correct format. Its always in that person's words, and I do stress that, because it's their statement not mine and they'd have to stand up in court with it, but if I just let them write what they wanted straight up, it would take twice as long and I'd only end up re-writing it all anyway. If you don't agree with what's been written then you shouldn't sign it, frankly, because it's a legal document once it's complete.
You make a very good point, you only have to view this site for a very short while to realise that, given free license, most people miss many points and blabber on with mostly irrelevant information. Myself included.