so basically a version of ‚divide et impera‘

I’m not exactly sure this is the reasoning of those who push intersectional theory.

Ben Shapiro framed it like this: the left uses this subsection victimhood groups (eg gay, black, woman, latino and so forth) to build a leftist intersectional coalition to push for radical agenda and specifically get some perks for each victimhood group like lower standards at college admission.