Telling someone "you don't get it" is a copout of the responsibility to explain yourself properly. Maybe it's you they don't get and they you don't get.

In this case, a topic which gets argued ad nauseum every time someone new brings it up to no agreeable conclusion, maybe the answer is to tell the questioner to do the research first and then ask questions about specific things. Tell them to use the search function. That's what people pay colleges for, to teach them how to research.