ilovetorah- You are so correct! Who would have thought that 100% pure Butter could be 100% non kosher- that is due the the legal adulteration of blending with Whey Cream and/or Cook Water Cream.
If there is one suggestion I would strongly advise to posters AND Poskim- PLEASE learn the “metzius” before commenting.
Re; Harav Moshe’s heter for Cholov Stam- he himself was makpid on Cholov Yisroel. Today there are even more reasons to be makpid as “the envelope has been pushed” quite a bit from the original lenience’s (- DA Cows. Yisroel Ro’ei’hu, accepting milk from countries with corrupt governments, etc.).