That is where in my opinion you are wrong.
Most people do need dog trainers!!!! Look back through all the posts on here. Dogs running riot, people being scared, lack of control..you may be the perfect unprofessional dog trainer, but there is obviously a huge issue.
Like I wrote hundreds of posts ago, If there was a law that dog owners had to have a professional, teach them how to train their dog correctly..where they are going wrong, what food the dog should be on etc..there wouldn't be this huge problem of dogs causing people and other dogs distress!! Once the trainer is satisfied, you can be signed off.
It would put a lot of people off owning a dog, as they would see it as hassle..and people would be safe in the knowledge, when out on walks etc, that those dogs and owners they come across, are well trained and educated.
Where is the problem in that?
Surely a law like that would only be beneficial?!