But if there isn't sufficient evidence then that is where it does end - yes some defendants have been found not guilty but that doesn't mean there wasn't a case to answer - that is the purpose of a trial.

In any case in your post you were referring to cases which might not even get to court but someone has been identified and vilified - there is very little that can be done in such situations because as I said earlier names will become public even though the police don't release this information.  I still don't understand what you think should happen.