So those men who would otherwise be in STEM must move to other professions, which means they either move into other male dominated professions and make them even more unbalanced or there must be an equivalent push to move them into a female dominated industry.
If we do the latter then a possible outcome is a system where we are allocating people to jobs based primarily on demographics rather than interest or aptitude.
The goal is gender balance, there's no need to fear that a woman or a person of color accepting a newly created STEM job will somehow push a white man out of his existing position. Let's be realistic here.
There are structural issues which can cause the workforce as a whole to not be representative of the population - lack of opportunities for poorer people / minorities or lower participation by women due to child-rearing, etc. Even after accounting for those,
I do appreciate the sentiment and effort, but most of what I've seen is empty belly-aching.
This comes off as classist, to me. I have had the impression that promoting equality and diversity in certain professions is partly motivated by a want to make more people feel welcome in the profession. That is, for minorities and such that already work in the profession to have a good work environment.
edit: Thanks for the downvotes. I must have hit a sensitive spot.
I'm surprised that you managed to get statistics about the disparities without also finding information about the various programs to increase diversity. They need to publicise those better.