It might be considered important - but is it really? Maybe it's because the woman is black, or Muslim, or has a "save the whales" bumper sticker, or even a Confederate flag on her bumper. The point is - it's not OK to run people over because of their beliefs. Trump seems unable to condemn such behavior convincingly.

OTOH - yeah, this story is incomplete. Maybe she crossed in front of him while he was driving and he just made a stupid comparison.