Um, cool. Netherlands...how is that relevant? I mean if someone wants to be killed with a roller coaster and they have expressed wishes to do so then I don't see the fucking problem.
Well in a sense they are. What I don't understand is how a state can take away someone's right to make choices about their life, based on a premise which they value but others may not. That's what I illustrated in that hypothetical dialogue - if someone wants to die, the state often won't let them. That's why euthanasia, abortion, suicide*, murder and cannibalism are all illegal, regardless of whether consent was given. I don't believe governments have the right to impose their personal values on others by restricting choices of individuals based on the values held by the current government.
Civil liberties are a social construct, of course. Which means they can be altered. Why not alter them to allow people to make choices about their own life based on the circumstances of their own life and their own critical and emotional analysis of their own life. We don't need to be putting so much effort into preventing people from doing things we don't like. We don't have the right to stop people from doing things just because we don't like them.
*this has been amended.