"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."
-- The U.S. Constitution
Sorry, it's not optional. All human governments exist, before anything else, to provide equal protection for the God-given, unalienable, individual right to life.
"We hold these truths to be self-evident, that all men are CREATED EQUAL, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men..."
That is the argument you make on a state-by-state basis.
The people who argue against the Supreme Court overstepping their authority from the political left can’t argue for that same overstepping of authority from the political right.
To your due process argument, do you have a problem when a woman has an ectopic pregnancy (approximately 1 in 50 or so chance) and the pregnancy is terminated (read: aborted)? I would hope not. Was there due process for the infant? No.
You may claim that’s not abortion. I argue that it is if you define abortion as the human intervention in a pregnancy where the death of the fetus is almost certain.
Does not plenary police power reside with the states? I believe it does.