I've never come across anything stating that "sound waves can be very damaging, to the extent of causing bleeding in the brain", could you post a link to your source?
I played about with BWGen for a while, it seems perfectly safe to me, but i didn't think it was very user friendly when it came down to creating tracks.
There's also a freeware available online called sbagen (http://www.uazu.net) which i've been experimenting with and obtaining great results, anyone else tried it?