People my age and over are still concerned about "the system". Conservatives still believe they can roll back the clock and bring back the good old days if they just teach the right things in school and make enough stuff illegal. Liberals are concerned that the conservatives might be right.
Younger people, grew up with a much more relaxed society. A lot more things have always been legal during their memory and a lot of things that are technically illegal, there is no enforcement of or penalty for and they don't give a shit if it's illegal or not. They realize that most of what they learn in school is bullshit and that every type of information, from every possible perspective, in every media, is available for free, 24 hours a day, on the Internet. They don't worry that a totalitarian government is going to suppress anything they want to do, say or find out. It's just not possible.
Younger people, say 40 and under, aren't really represented yet in positions of political power. They will be soon. When they do start showing up, it may seem that they are more conservative and apathetic about protecting basic freedoms. I think it would be a mistake to think that's true. They just don't feel threatened. They're right.