“How is enforcing the most important, explicit, imperative requirements of the Supreme Law of the Land “illegal”? “
BTW, there is no “most important” or “explicit” part of the Constitution.
Have you ever actually read it?
The Constitution is explicit about the equal protection of the right to life of each and every innocent person, in every jurisdiction.
You have to be trying to miss it to miss it.
“No person shall be deprived of life without due process of law.”
“No State shall deprive any person of life without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.”