First, there are ballot measures, judicial elections, city council, school board, and many more offices that have nothing to do with party politics that are on

First, there are ballot measures, judicial elections, city council, school board, and many more offices that have nothing to do with party politics that are on the ballot in almost every election. You'll never know what they are if you don't participate. "Should dog racing be banned?" and "Who should hold the office of Soil & Water Conservation District 9?" have nothing to do with party politics or mental health. Second, for party elections the vote total still matters. It's a message that says how strongly the electorate feels about particular candidate or issue. There's a big difference between a 49.9/50.1 result and a 70/30 result. When you don't cast a vote, you are still sending a message. There's a huge difference between expressing a minority opinion and saying, "I don't care just do whatever you want. It's all a sham anyway."