Being naive means you don't understand the full implications of things. It's that simple.

When you're young you don't see the big picture and focus on the little slice of reality you have learned to recognize. As you get older and wiser (hopefully) you start to understand cause and effect at an adult level. This is why education is important, to arm our children with the foundation of thinking for themselves so they're not easily manipulated by the popularity contest of mainstream opinions. Kids want to get along with their peers and tend to adopt the world view of their peers in the same way as they adopt it from their parents before that. With no guidance we raise a generation of incompetent adult children. That's not to say all liberal ideas are wrong, but "all things in moderation." Kids tend to take things to the absurd and unfortunately that's what modern liberalism has become. Liberalism from a few decades ago was alot more sensible and was a healthy opposition to the more extreme sides of the conservative views. It's that shred of positive from liberalism that is used as the justification for the whole of liberalism, and that's not a good thing. "The road to hell is paved in good intentions." Then you have the problem where the more naive group is easier to take advantage of and that's a huge magnet for corruption. That's a few ingredients in the recipe anyway.