It's wrong to hack things.
Mika is a self taught computer programmer and is reading about computer topics online.
Mika wants to learn something new on the computer.
Mika learns about contributing to online resources that other online users can use.
Mika learns about network and how to use vulnerabilities in networks and decides to put it into practice against other online users.
Other online users benefit from the work that Mika contributes and learn something new themselves.
The other online users that Mika hacks feel violated and sad that they were targetted.