If you are talking about un-ethical hacking then obviously the people you have ever been hacked are ought to be afraid,but until you haven't experienced this you will find it cool and interesting.

Their are two types of hacking:
1. Ethical(white hat) hacking: In short they provide security to cyber world. They hack things for good purpose.
2. Unethical(black hat): they steal someone's data for their personal gain and harm others.

My personal experience of knowing about the person who is a hacker(unethical) was a bit different, initially I found it interesting and really cool but after some time I realized this is not good and if you are caught then their are strict legal actions against you.