Also, we can all have biases without it meaning people are being racist. My parents like rock music, so I'm biased towards listening to that over country. I went to certain schools and that colored my world view. I once heard bias described as a heuristic the brain uses to make quick decisions- something that was extremely useful for primitive humans but which needs to be actively balanced in our complex society. A huge part of that for decision makers is exposing themselves to other viewpoints as a way to collect information they themselves wouldn't have gotten. There's a reason why companies have used things like focus groups and surveys to understand their customers- having more people who understand those customers in leadership at companies is an even better way to do it.
This is nothing particularly new. It's the history of America, which was founded by and for white men, and whose story can be told as white men slowly and reluctantly giving up their power.
If "many (most) 'white men' do in fact care", history doesn't really demonstrate that. Not, at least, in terms of doing anything about it. This is not particularly shocking; people care more about problems they experience, and less about problems that happen to benefit them.
We need only look at how the majority of white men supported a blatant racist and sexist for president. And who continue to support him despite (or because) that has only become more clear.
I don't like the implication here (i.e. white men don't care about harassment/abuse and they are also stupid.) I would wager that most anyone of any color or gender or religion in any high position of authority at any company cares first and foremost about the financial viability of the company they have been charged with running.
Many (most) "white men" do in fact care about this stuff and aren't bigots/sexists/racists. You're naive and part of the problem if you think this is a "white male" issue and not a much more complex problem. In fact, you're exhibiting the bias you attribute to these managers.