I am just learning, so I'm perfect to answer from my end of thinking.
I want to hack so I can save children who are being exploited by adults. Children placed in compromising situations. Hacking is a tool which can potentially save lives.
I enjoy the benefits of hackers who produce information which is otherwise withheld from us. There are others who hack to find out if a suspect is indeed part of a crime such a murder.
Some people hack because they have revenge on their mind. ...Some people I feel very vengeful towards, but I have two options for them. I marry a sugar daddy and sue them or marry a hacking genius and have them take care of it.
In 2005 (I think) I was an intern for a Sheriff Department. The patrol always said, "Piss off a cop and he'll make your life a living hell. Piss off a techie and he'll delete it." Naturally, we were advised to give techies breaks so our lives stayed in tack. Personally, everyone got breaks from me. I was very understanding that they are having a very crappy day. I kept in mind the whole picture such as previous tickets, but I still didn't allow that techie business to affect whether I was easy on them... NOW I see just how wrong I was.