Read the bold again and get it through your skull: it can't and won't stay private. The evidentiary laws regarding forensic tools and solutions in the United States require that it be peer reviewed, else a defendant could easily make a case that the tool itself manufactured fradulent inculpatory evidence. And once the workaround is known externally, it will get reproduced.
There's no middle ground on this. Either entities like Apple, which actually have power since it is clear that we simple peons are totally disenfranchised and disregarded, stand up to these jackbooted, McCarthyist fascists or they don't. If they do, we have a fighting chance at keep the civil liberties of which you speak so cynically. If not, well...the result is far more nightmarish that anything we have dealt with from any knife-wielding extremist.