You can hurt yourself any number of ways that are completely legal.
The argument "X should be illegal because it can be dangerous" doesn't work for me.
If you don't want to get into the political discussion my statement is drawing us into, I totally understand.
I'm confused because Wix responded to a question of the form "Why is X illegal" with an answer of the form "X is illegal because Y", and you seemed to respond as if they had said "X should be illegal because Y".
I'm not sure if it was a good idea to point this out.
http://www.theverge.com/2012/8/8/3177438/cyborg-america-biohackers-grinders-body-hackers