The problem is that the other guy is saying the same thing you are. The radical left and the radical right both think each other's points are dangerous. And the moderates are pointing at both sides and claiming the same thing. From their respective viewpoints, they're in the "right", just as you think you are.

There's a slippery slope here, and I feel it's one so large that we can't even tell we're already sliding on it.

The obvious answer is a well-informed populace that isn't easily swayed by emotion and fear, and has the time and inclination to do their own fact checking. Trouble is, that's obviously a pipe dream. Other ideas, such as Facebook's new governing body are interesting, but I fear will be troublesome in other ways. Still, it's an experiment in the right direction I believe.