It's not the idea that is dangerous. I can hold multiple incongruent ideas in mind to compare them. It's the experience that get's me at an emotional level, tha

It's not the idea that is dangerous. I can hold multiple incongruent ideas in mind to compare them. It's the experience that get's me at an emotional level, that may change my opinion. Well, ideas may inform the intdrpretation of an experience, and holding an incongruent set of ideas, the reaction may be arbitrary. Arguably if one idea can take hold, then because the tendency was already there, latently. An extremist is, by definition, someone going to extreme ends to reach a goal. I don't think that holding an extremist's opinion is directly extreme. Having extremist ideals just makes for a latent extremist. That's radical, not extremist. That's still tendentially bad, anyhow. But so is ignorance, and so someone knowing only one side of an argument is merely ignorant, not necessarily latently radical. Ignorance doesn't need a medium to spread. Quite the opposite, it needs barriers. YMMV though, as bias is such an important topic in learning. It might count as barrier as well, if figuratively speaking.