Over time I have gotten a little more interested in politics and voting. but when i was not interested, me voting was useless. I did not make a informed decision.
I live in country where voting is compulsory. (Actually it is showing up at a polling booth is compulsory. Compulsory voting isn't compatible with a secret ballot. The name choice is unfortunate because it sends the libertarians into a frenzy.) Turns out it's not an "informed decision" that's important. It's avoiding making a dumb decision. Regardless of whether you follow politics or not you do know when politicians make dumb mistakes, particularly when they effect you. I can't imagine too make people in New Orleans voting for Bush after the Katrina debacle for example.
It turns out that's all that is required. The people who care enough about politics to vote are the dangerous ones, because a fair percentage of them do not make an informed decision. They vote for tribal reasons - gun laws, "I'm a democrat" or whatever. You think you are making an "uninformed decision" and therefore it must be poor but trust me, it's infinitely better than those who vote the same way regardless of how they have been informed.