Can you speak more about the framing? I think diversity should be encouraged, but I also believe to some extent that people of color have been left out of STEM education and jobs due to poor education and opportunities. Maybe a middle ground is to hire for both. Bring in women, people of color, and others who may not be as educated or experienced, but make a serious effort to pair them with more experienced employees and train them up to where they should be. Rather than hire and replace, as some have suggested, hire and partner to diversify and holistically improve the entire organization.
I think you are right about starting early in education and exposing disadvantaged children to things they wouldn't otherwise have available to them, and supporting them throughout their education. This would benefit organizations that want to achieve good performance and is worth them investing in themselves, although government support is a decent second option that I agree with. However it's important to note that this is primarily an economic differentiation, not a racial one.
Training can help but it is not sufficient for many tasks. You also need aptitude and desire.
Culture is more about what is valued and rewarded in a society, and I think the primary driver of the desire component.
What I meant about framing was that our economies, governments and businesses are framed in a cultural context, anglo-protestant american capitalism in this case. African-american/black communities have a challenging relationship with this for obvious reasons. Certain immigrant populations can integrate or interoperate more effectively than others. I think the key to achieving better results as a society and a planet is to incorporate more cultural diversity, allowing a broader range of desires and outcomes to be seen as valid and worth pursuing. I'm sorry I don't have more time to go into this right now, I hope it gives an idea what I was referring to.