Many things hurt the poor more, because there are many things that the poor do that have negative externalities that cannot be compensated for by the productivity of the poor. Strict enforcement against violent crime is pretty regressive in that more poor people are incarcerated when this is done. Others are that strict enforcement of traffic laws is pretty regressive; paid parking is regressive; as are fares for buses and trains. Requiring a minimum number of signatures for a ballot proposition is regressive. Allowing more expensive cars to incorporate more advanced safety features is regressive. Requiring grant applications to be carefully written is regressive. As are minimum flying requirements for pilots. DoD medical standards for soldiers are regressive. Officer ASVAB score requirements are regressive. Surgical requirements. Drug approval requirements.

In fact, anything that requires a standard of performance will be regressive. We don't have to subordinate all goals to regression avoidance. In fact, no functioning society does that.