Some of those will happen too, either by design or by accident. You can be sure that 9 months after these protests, some white ladies will be giving birth to black babies.
Of course this is not new with the current protests. All the way back to the Civil Rights marches in the 1960s, white women showed their support for the cause by giving themselves sexually to black men. After a demonstration ended, the usual practice was to return to the motel, campground, or wherever they were staying and have sex. After all, if you are a white woman demonstrating in support of black people, you can't very well say "Sorry, no touching."