People conflate these issues for the same reason people conflate theism with Christianity: they’re both so unlikely as to be interchangeable in most circumstances and the people who advocate one are almost always advocating the other.
There is probably an analogy we could use in which the chief antagonists in one are not a counter-example in the other!
There is probably an analogy we could use in which the chief antagonists in one are not a counter-example in the other!