“Nobody argued that it’s “OK for a teen to have sex and get pregnant.” “
That is not true.
I think you are confusing acceptance with approval.
I like the way Dennis Prager describes his position. “Standards in the macro, compassion in the micro.”
I have a 17yo son who, knock wood and hoping and praying, is not yet sexually active. I talk to him more than he likes about all these issues. He knows where we stand. But if his girlfriend became pregnant, what should we say? Get the heck out of my house, sinner? You have to love and support your children in order to ensure the health and well-being of the next generation, if for no other reason.