Exactly, it's a lot like religion, except that at least with politics you can at least attempt to bring facts and data into the discussion in an attempt to disprove the other side's points. But people still treat it like a religion so it generally just isn't productive to discuss it, unless you're among people who are generally like-minded, and you're only hashing out finer points (e.g., would policy A or policy B be more fruitful for reducing global warming? Rather than arguing over whether global warming is real or not).