A world without humour is a dull place
Kinda the world we are living in now.
Thats why you need to be insane in order to keep the dullness out. Those who let in the dullness become nothing more than shells.
Quite right all great people have a certain lvl of insanity to them the trick is not allowing it to consume you.
Well if you are aware of your emotions and actions then you should be fine.
For the most part that’s true but there are people who do crazy and terrible things knowing full well what they are doing.
That is true but when it really comes down to it, its a balance of "good" and "evil". You need people doing terrible things so that people can do good things.