Actually, it is hard to judge those people, as it is hard to judge criminals. I don't like to defend criminals, but I have a deep interest in psychology and how the human mind work. There is many people studying it and I like to hear what they say.
It starts with dicks that have nothing better to do with their lives but to steal stuff and go where they are not supposed to go and break laws. Please, excuse the language, but you have to admit it is true.
For example, there is a playlist on TED of 6 videos where they talk about hackers.
One of them is about how the biggest hackers got into this life (btw all of them were arrested and interviewed). But this video in specific is all about how the government should hire those hackers and provide better conditions to them instead of hunting them.
EDIT: Many people recommend Kevin Mitnick's The Art of Deception book (I personally can't because I haven't read it). Now, I have read some chapters of the recent (2011) Ghost in the Wires book on the bookstore, and it seems pretty insightful.