If Reb Moshe ZaTZaL allowed a temporary leniency in America because of government inspection where Chalav Yisrael was not available, he certainly wouldn’t have done so so we should immerse ourselves in Frusen Gladje and Kinder Chocolate Eggs. It was meant for basic staples. But that is beside the point.”
Why do you think it was a temporary leniency? The leniency was b’davka BECAUSE the government inspects and regulates the sale of milk, to ensure it is only sold from cow milk. If the milk is permissible, what have you got against someone enjoying ice cream or milk chocolate, as well as drinking milk?
It is not for any of us to ascribe motives to the permissibilty of using a food product. If it is muttar, it is muttar. If I want to drink a clearly kosher milkshake because I LIKE IT(and not because I need the calcium), who gets to tell me that it’s only OK if I drink it plain with no flavoring, because apparently that someone thinks I shouldn’t have enjoyment of it? I never ate either Frusen Gladje OR the chocolate eggs, but if I wanted to and it is KOSHER, I would.