You’re correct that the patent should’ve never been awarded, but the regulation still caused a problem today - something that could’ve been avoided if a cause-effect analysis was done. This is a problem statement that is applicable to most regulation today.
That’s why you an analyze cause and effect. You should target the highest driving factor and ban that, not blanket ban and catch things in the crossfire that don’t make a statistical difference to what you’re trying to improve - that way you don’t cause ill effects elsewhere.