Things that shouldn't exist:

1. Methandrostenolone/Roids/Anabolic or not

2. Lies

3. Ugly internet sites

4. Credit/loans

5. Pesticides/Hormones

6. Animal cruelty/Child abuse

7. Violence in general

8. Discrimination/Prejudice

9. Chisme/rumors/gossip/talk

10. Greed that pays

Just my opinion, there's more, but then that'd be too long. I guess they need to exist to see how well we do to avoid them.