My 2centz, The passage addresses the issue of women who are truly helpless; it exonerates them. Trump's "assaults" took place in very public places. In most cases, they could have easily been thwarted. 

The passage is referring to betrothed women: Deut. 22: 25  (AV) "But if a man find a betrothed damsel in the then you shall bring them both out to the gate of that city and you shall stone them to death; the girl, because she did not cry out in the city, and the man, because he has violated his neighbor’s wife. Thus you shall purge the evil from among you."