I agree, and for that matter, do the scientists have an explanation for why the ice age glaciers covered nearly half of North America, much of Europe, but almost none of Siberia, when Siberia is colder than the other two places today? I suspect it has something to do with the north magnetic pole being on the Canadian side of the Arctic.
My view is that the glaciations didn't happen (nor will future ones) due to gradualist, uniformitarian causes.