The math and physics communities aren't dominating business in the US. Four of the top five companies by market cap (Apple, Alphabet, Microsoft, Amazon) are exclusively software or employ an oversized number of software developers compared to similarly sized non-technology companies. If there are reasons that groups of people are being systematically excluded from employment in those companies and others like them, it's worth at least trying to understand why (race? gender? other factors?) and wherever possible, worth trying to correct it.

"Why now" is a lot more complicated than just that, but that's the reason I keep in mind why it's worth fighting for.