Why is it that security (hacking) distros went so popular?

I see more and more posts pictures even on devrant featuring them. Even I see people at my uni that are on kali. I can't believe all of them are that into security. I even know two linux noob friends that wont listen to advice and went to kali as first distro.

I'd never use kali/parrot/whatever vs my current manjaro setup... I'd rather go back to arch.