However, if you are found guilty at the CM, the powers of punishment are higher than that of a Presiding Officer at a ST.
Having been 'the accused' before, a witness, and the one who recommended charges on more than 1 occassion, I think the ST portion of the military justice system does the exact job it is supposed to do. I didn't think that when I was 'the accused' of course but...hey, I was just a kid.
Its a system, and like all systems, its not perfect but it works. All your statistic indicates is that 97% of the charges that go to ST are determined to have been "acussed is guilty". That doesn't account for the DIs that happen that the unit, ULA, JAG, etc decide to not proceed with, or handle thru other ways (extras, defaulters/PUPS/BIRDS, etc) or thru Admin measures (Remedial Measures, etc).
IIRC, a minor charge with a fine of less than X amount of dollars comes off your Coduct Sheet after X amount of years (or mine all did). However, something like C & P stays on your Pers File forever. Sometimes a ST is better in the long run than a RW or C & P. Depends on the situation.