The data indicates that women are underrepresented in STEM field, but we can also argue that men are underrepresented in educational field. Why aren't there more women in fields like firefighters, oil rigs, dangerous jobs?

Fundamentally, men and women are different both biologically and psychologically. To generalize, men are more interested in things and engineering and women are more interested in people and relationship. But that doesn't mean their intelligences differ. Intelligence expresses itself in different ways.

If a little girl says to her parents that she likes math, it's not like her parents would say, "no, you can't like math, you should go play with your dolls, math is for boys".

We can't equalize outcomes, there's no way we can have 50/50 across every field. What we can do is to equalize opportunity and level the playing field. Accepting women or men for a job just for the same of equal representation at workforce instead of evaluate their abilities for the job is just plain irresponsible.