@High Seas,
Let's see what the dictionary and the rest of the world have to say about 'insane'.
Insane - adjective
1. Not sane; not of sound mind; mentally deranged.
2. Of, pertaining to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
3. Utterly senseless: an insane plan.
Now let's look at the definitions more carefully.(With commentary from yours truly, free of charge

)
1. Not sane; not of sound mind; mentally deranged.
Well, obviously NOT sane. Hence the IN contained in the word INsane. Thanks for clearing that one up for us Mr. Dictionary. What the hell is a 'sound' mind, and who is deeming it 'sound'? The same person with a 'sound' mind would like everyone to think that his mind and all minds like his are 'sound'? Doesn't that seem a little biased to you? How do you know if someone is mentally 'deranged' and why are you pointing it out? Maybe you're the one who's 'mentally deranged' for pointing it out! Apparently this mentally deranged person has stopped you from going about your day in its would be fashion, for no reason other than the fact that you had to point out his 'being deranged'.
2. Of, pertaining to, or characteristic of a person who is mentally deranged: insane actions; an insane asylum.
Again, who's defining these characteristics and why? We already went through 'deranged', same would go for 'insane actions' I suppose. An insane asylum is just that! Only the ones who are truly 'insane' are the ones who built the asylum. Not the people in it.
3. Utterly senseless: an insane plan.
What sort of plan would 'make sense' and to whom? Why are we concerned with 'making sense/not making sense'? If you had been all alone your whole life, would you ever worry about 'making sense'?
Call me insane if you like, but just remember this.
Look up at me and see a god, look down on me and see a peasant, but look straight at me and see your 'self'.