I am afraid that if all groping offenders would have to be punished, you could expect about 80 % (or more?) of the male population (also men are groped, and there are also female gropers) to be drawn before justice.
But the real damages and the on-going of the spiral of abuse and violence cannot be stopped with punishments, further injustices and cruelty - even after a long time. Additionally, laws exist often since long, but they could/can not be enforced, in too many cases - even today.
Considering the deep rooted mentalities (and education) and distorted beliefs or perceptions, the real damages to mental and physical health and later sequels were rarely noticed (many women were and are considered as property, as a thing and not a person, and if damages were paid, indemnities went to the husband or the male "owner(s)" of the victim's family).
Furthermore, in Western civilisations, flirting manners were not always so gallant like in fairy or knights' tales, and quite a few girls or women would slap, kick or (according to Far West or pioneers' movies) even shoot at too daring offenders.
What was and is, of course, "deplorable" is the systematic abuse of authority and power over depending, weak, defenseless and vulnerable people, namely children, employees (working poor or modern slaves), handicapped, pupils, trainees or students, or even wives (battered women, for instance), etc., bullying and/or sexual harassment.
No, I am not excusing former offenses, but many people will, with increased awareness of social, cultural and medical isues, recognise and learn from their errors, and they will try to make up for their offenses or ignorance, if they are honest and have a conscience. Extremism, hysteria, vendettas, violence and hate campaigns are no solution.
Why do we see the mightiest and wealthiest ones treat other people with so much arrogance and contempt? And how can so many valuable persons be wasted and dumped suddenly like trash after use (and/or abuse)? Because privileged people will, in most cases, get away with it, as mentalities and attitudes did/do not evolve sufficiently. Crooks, narcissists, "sinners", abusers and other "bad elements" are found on every side.
Yes, there were and still are witch hunts, victim shaming, scapegoating and discrimination campaigns, harassment and bullying, and we hear a lot about more or less privileged people with perverse practices or preferences, and also false accusations.
And there are still too many, fed by unhealthy propaganda, prejudice, superstitions and empty promises, who believe that disasters only happen to others.
Raising awareness among the crowds and their leaders might be a first step to find a way towards more sustainable issues and mutual respect.
And even if people realise since a certain time how inappropriate and abusive such offenses are, the great majority is still caught in outdated patterns of principles and values ...