"Laws should always be enforced." Like the laws that made slavery legal on US soil? Like the laws that mandate jews business ilegal, made them move to ghettos

"Laws should always be enforced." Like the laws that made slavery legal on US soil? Like the laws that mandate jews business ilegal, made them move to ghettos and finally to concentration camps in Germany? The laws that expropriated private property on Russia, made agriculture collapse and people nearly starve? Same thing in Cuba not long ago. Like laws that make intellectual property common ideas like software patents and make small developers servants of the big entities?