Fair enough, I suppose.
Still though, if they're not following them now, what leads you to believe that they'd suddenly start doing so again in the future?
How is it not?
It's not like they didn't care and used the TV as a babysitter every time they went out or anything (though I do tend to joke about it with them from time to time); they just obviously realised that I was growing up and was mature enough to do so at that point in my life, and I just happened to do so a little earlier than expected.
To put things in perspective, I used to have a friend whose mom wouldn't let him stay over my house for the night without meeting my parents... and he was a Senior in High School at the time, who was going off to serve in the military the following year. There is such a thing as being too over-protective.
Again, they should be taking their maturity level into account instead of their age. And yeah, parents should be held accountable for determining what content is ultimately appropriate for their children, but at the same time, kids are also growing up a bit more with each passing day as well, so there's eventually going to be a point where they need to stop shielding them from the world at large and simply let them do so on their own.