Do we need new laws or adherence to the old ones?
Yes.
Both.
The United States has an ancient Constitution. It doesn’t ban slavery as punishment. It doesn’t ban bribery as campaign funding. It doesn’t protect the natural world. It doesn’t guarantee basic human rights to food, shelter, education, healthcare. Its system of “representative” government doesn’t fairly represent. New laws are needed.
On the other hand, the United States has numerous laws on the books that just aren’t enforced.