This isn’t your fault at all and believe it or not I actually feel badly for you. The unfortunate truth is that most professionals have witnessed work place abuse, frequently gender based, and done nothing about it. You didn’t actually witness it but you clearly had reasonable knowledge. I consider it extremely likely that your attempting to handle this in the ethical and legal fashion would have jeopardized your position at the company. It’s quite common that companies retaliate against the victims of harassment and anyone who aligns themselves with them. Since one of your supervisors had reasonable knowledge I feel confident that the corporate culture includes covering things like this up and turning a blind eye. Who knows, maybe they will prove me wrong. But, this wasn’t your fault, even if you were the one who referenced the perpetrators notes.
Honestly, when someone has to choose between their own job security and taking the ethical course of action most will chose their own job security. That is a complex moral decision, not a simple one. And, I’m not saying that’s what did happen it’s just an educated guess. It’s exactly why most people remain silent and turn a blind eye to this type of thing. The bottom line is that one of your supervisors had reasonable knowledge and this isn’t your fault, at all.
Simply put, it isn’t ethical to hate someone or try to ruin someone because they did what is considered normal within their own society. However, as long as the silence continues these tragedies will continue. Some are teenage suicides due to bullying, some are sexual assaults that go unpunished by our legal system and even universities and others are cases of workplace abuse so extreme that they are traumatic be they harassment, assault or otherwise. We are also typically silent about domestic abuse and child molestation, both of which are disturbingly common.
In short, we are silent about abuse of women, other minorities and children. This isn’t okay. I have always been quite passionate about women’s equality and I see no distinction between women’s rights and human rights. If I were to remain silent then I would be an incredible hypocrite. Moreover, these are human rights violations and public health issues. Something must be done. And, nothing will be accomplished as long as silence is the norm. The silence can only be broken one voice at a time. And, every single voice actually does matter.
But, I don’t hate you and I hope that you aren’t used as a scrape goat or ostracized. What you did is considered normal by society and it’s what most people in that situation do. It’s the social norm that is evil and wrong, not you or your team members.