Reply To: If your friend eats chalav stam, is it evil…

Joseph,
I agree, even according to Rav Moshe, Chalav Stam is a Kula and not the other way around. Not drinking Chalav stam is not a chumra. Rav Moshe agrees that according to many poskim (Chasam Sofer, Pri Chadash) it is still considered Chalav Akum. Same with eruvin, Rav Moshe wrote that there are definitely on what to rely on and, the ones permitting it have legitimate heterim.
Furthermore, as per minhag through out the ages, poskim relied on all kind of kulos when it came to Eruvin. See Avnei Nezer hilchos Eruvin, Chasam Sofer and others, some basing it on the Gemara הלכה כדברי המיקל בעירובין ואבל”