It's a little of both. I know very smart people with highly technical jobs who are political ignoramuses simply because they don't want to spend brain cycles on political topics. The smarter ones at least do not express strong opinions either way. They might fit into your definition, but far more people are either low IQ or criminally ignorant. Political philosophy is not so difficult that "living your life" gives you an excuse not to be aware. I must assume people like that are largely unthinking until something pokes at them. That something usually being an emotionally manipulative news report.