b1shop:

No matter how much or little I think about politics, the chances of me being the marginal vote are negligible. There are better uses for my time than that mind-killer.

That's true as far as voting goes, but politics is about much more than voting. It is rational to ignore politics only assuming that the situation will remain stable and tolerable where you live. If more interesting times come to pass, then the ability to recognize early signs of trouble and plan accordingly will be extremely valuable (which I can confirm from personal experience). Now of course, you may believe that this is highly unlikely, but to have any certainty about it, you must have a certain level of knowledge about politics and keep track of political developments to at least some minimal extent. So in any case, complete cessation of thinking about politics cannot be rational.