Originally Posted by
Singu
It's for the simple reason that if you can't explain "why", then you have no idea if it has anything to do with it or not.
Saying that there's a "type" is another way of saying that if someone is a certain way, then there's a very high probability that the person will be acting in the same way in the future. Which may be true.
But that's just an assumption that the person will be acting in the same or similar way in the future. It does in no way explain why he's acting in that way. It's just an attempt at predicting behavior and bypassing having to explain things. And a bad attempt at that, since true prediction isn't just expecting the same past trend to continue. Somebody may suddenly change his mind, and then what? The prediction becomes impossible.
But you can explain why he changed his mind.