If the case is backed up by sufficient evidence, the best solution is for the suspect to face a firing squad! Once you do this to a few people, the rest will have learned a lesson. The fear factor might work to deter more rape crimes. Rape leaves a permanent emotional and even physical scar to the victim.
You raise an important point.
In many western countries accused man is considered guilty until proven otherwise.
Any tribunal that uses inquisitorial rather than adversarial procedure is assuming guilty until proven innocent. Under inquisitorial procedure, the judge or presiding officer is an active participant. Under adversarial procedure, the judge is an impartial referee in a contest between a prosecutor and defender.
Conviction rate is a good indication of whether suspects are getting fair trials. Conviction rates average 60-80% in US state courts, where trials are generally fair. China's and Japan's 99% conviction rates tell us trials in those countries are unfair. US Federal trials also have a 99% conviction rate, but the even more astounding statistic is that only 3% of cases go to trial. Fully 97% are settled by inquisitorial plea bargain.
Thus, the evidence says China, Japan, and the US Federal system treat suspects as guilty until proven innocent, regardless of their stated rules of procedure.
