Co-sleeping is one of the most natural things in the world and very safe. Any implied danger is probably used to hide other flaws in the healthcare system. Although i haven't validated this, I understand that in Japan, co-sleeping is commonplace until around 2-3 years old and they have the lowest infant mortality rate in the world. We have done it with our children.
You're right, it's one of the most natural things in the world! What happened that made people believe it wasn't?
I believe that about Japan having a low infant mortality rate!
I'm glad you enjoyed it with your children!