That's debatable, but even if you think it is dangerous and stupid, don't people have the right to do with their bodies as they see fit? Don't they have the right to be stupid? And how is bug chasing any more stupid than many extreme sports, or sky diving, etc.? Why do you have a double standard for things that are sexual in nature?
Criminalizing HIV increases the fear surrounding HIV and makes people less likely to get tested. We think it's more important that people know their status.