Remember that one thing we were taking about KSD and then Nadia said it wasn't true. He does have a point . Most of the stuff in Wikipedia can be outdated or edited by someone else
I believe every single word Nadia says. But I also consider that Nadia probably comes from a wealthy, open-minded and probably protective family and that she is very young. So her perspective on things might be special.
I remember that I thought Switzerland is the perfect country when I was young. Nowadays I know that most things are as messed up as in the rest of Europe. Even what we are told in school about our history is mostly a lie.
Wikipedia gives a great overview about things and warns you if an article is not reliable enough with another box. It usually also provides sources.
Like everything you have be cautious about it, but nobody will ever tell you the truth, there is just none. So if you don't trust it investigate further.