I will admit i downloaded kali-linux to learn how to hack. But i am doing so legally! If you are hacking legally it is perfectly fine. I am not trying to destroy or mess with anyone else's things i am trying to learn the art behind hacking and how it is done because computers are very interesting to me. As long as you are obeying the law and not hacking to mess with other peoples things it is completely okay to want to learn how to hack.