Insanity does not bar a person from having practical or insightful thoughts. One should be more wary of things they say, but they're not incapable of rationale. Ted obviously has some intelligence in my eyes and brings up what I feel are some valid points...
-Modern man is far more isolated from nature than is healthy for him
-In many ways, more primitive lifestyles were more satisfying
-In modern society we're trying to fill a void in our lives with "surrogate activities"
-In the past, man was much more at the mercy of nature and less at the mercy of other men. Now the opposite is true.
There are many holes in his thinking, many flaws. You can see him go off on tangents and deviate into hateful passages, but the man can still bring up some weighty arguements. Like you're saying, with these types especially you need to take everything with a grain of salt and have your BS meter on, but really you need to do that with most everyone. Be careful, but don't toss his writings out as worthless due to what he's done. Oh, I forgot a good one....
If we had never done anything violent and had submitted the
present writings to a publisher, they probably would not have been
accepted. If they had been accepted and published, they probably would
not have attracted many readers, because it's more fun to watch the
entertainment put out by the media than to read a sober essay. Even if
these writings had had many readers, most of these readers would soon
have forgotten what they had read as their minds were flooded by the
mass of material to which the media expose them. In order to get our
message before the public with some chance of making a lasting
impression, we've had to kill people.