Hooray, we're getting there slowly, except that courts deal with people who are suspected of being guilty, not suspected of being innocent. Why on earth would the CPS send a person to a criminal trial who they suspect is innocent?You are mixing concepts and potentially looping back on those concepts.
You are consider/presumed innocent until proven guilty. The court/jury has the job to prove you are guilty. If they cannot do that they return a verdict of "not guilty". This is BECAUSE they are not tasked with proving you are innocent as that is already assumed.
https://en.wikipedia.org/wiki/Presumption_of_innocence
If we flip this thing around to where you are guilty until proven innocent we end up in the same situation but with much worse consequences to freedom. While there are situations where a court cannot, with the available evidence, prove guilt, there are also situations where a court cannot prove innocence. If you were to be presumed guilty until proven innocent you would effectively have to serve an jail sentence as guilty until you can prove you are innocent. Do YOU want to live in that world? Have you ever been accused of something you didn't do? Ever felt what that is like?
For a moment I thought you almost understood, but I still get the feeling that you think "not guilty" is the same "innocent".