Because people have finite time. Most of it goes to work, some of it goes to sleep, the remaining time gets spent on not looking like a hoarding caveman (or if you have kids, kids). So if you get an hour of actual free time in your day you probably have it pretty good. Now, do you want to spend that hour on politics or do you want to chill from your day?
Keeping up with politics is a luxury most people don't have.