Nom, asserting that fear of govt companies is a mirsas is still a chiddush that the chazon ish does not address, but now i get what you were trying to say… it’s still not clear, and the chazon ish ended with a tz”a.
As for bedieved – it wasn’t easy to get cholov stam in the 1950s when rav moshes children were growing up. That’s a bedieved situation. But even in that case, he personally did not drink it and je said rhat they should not serve it in yeshivos.
Even in the 80s it wasn’t as easy as it is now for most frum people to get cholov yisroel.
As it were, if i lived in a place where it was hard to get cholov yisroel, i would rely on the heter myself.