Rubbish. Bob from the car factory can take a sabbatical without the free world sliding into tyranny. In fact, very little that I have done in my life - if anything at all - has had any appreciable effect on free society. This is the kind of "I know this is rubbish but it conveys an ethos I want to convey" statement that's sending language and meaning into decline.
A single individual slacking on maintaining a free society isn't going to end everything, I agree. That was never my point. Collectively, the majority of people in a society must maintain vigilance.