Explanation:

Ride roughshod over (idiom):

to act without caring about how you will effect someone or something.
to act in the way you want to, ignoring rules, traditions, or other people's wishes

This term alludes to the practice of arming horses with horseshoes mounted with projecting nails or points, which both gave them better traction and served as a weapon against fallen enemy soldiers. By 1800 it was being used figuratively for bullying behavior.

Ex: He was a bully and rode roughshod over his workers whenever he felt they weren't working hard enough.
They accused the government of riding roughshod over parliamentary procedure.

Hence, option D is correct.