Philosophy requires data. One has to be old enough to have some. Is that the reason? Philosophy calms me down. It's the most sane thing in the world ... at least for me. Give me an example of this "insanity."
It's the difference between a whore and a lover.
Examples of "insanity" caused by philosophy... Okay, let me count the ways my dear Applepi:
Well things like this for a start:
"I am. I am, I exist, I think, therefore I am; I am because I think, why do I think? I don't want to think any more, I am because I think that I don't want to be, I think that I . . . because . . . ugh!."
There are many examples and ways of being negatively affected by it, but the most common examples are:
1) The famous "nothing means anything so I'll just stay in bed and/or shoot myself (in extreme cases)".
2) Jean Paul Sartre's existential Nausea (hard to describe, read La Nausée if you want to experience it, the book's character describes it perfectly).
3) Wittgenstein's language games where it's ultimately impossible to understand one another. "What's the point of trying to communicate, everything I say is misunderstood"
4) Finally, philosophy has a tendency to make you feel absolutely helpless and tiny in the face of the absolute uncertainty of existence, most of the questions are ultimately unanswerable (as of yet anyway, not trying to be defeatist or anything). Philosophy is doubting absolutely EVERYTHING and humans tend to find uncertainty very unpleasant.
Stuff like that, I call it insanity because if you focus on these questions and obsess over them all the time, it renders you incapable of dealing with down to earth normal society things (as I have experienced myself on several occasions.) I would vaguely define insanity as "being incapable of functioning within society" (needs more thought) The only way to get rid of an existential crisis is to force yourself back into the every day things and stay occupied, because usually you won't resolve it, just come to terms with it.
Obviously there are loads of wonderful, life-changing moments as well.
What d'you think?
I think I've reached the point where I've learned to stay detached from the theories, now that I've been through all that and the ground is cleared I can start building. (at least I hope so)