"Where has SCIENCE demonstrated by experiment that mutations produce good things for a creature or plant?"
Antibiotic immunity in bacteria. It has been done and is repeatedly done to test new antibiotics.
Your ideas that mutations have to positive for organisms are misplaced. Due to natural selection, only the positive ones are selected, but positive and negative are relative. This is what sickle cell anemia illustrates. Its positive in malarial areas, but negative in populations not exposed to malaria.
So, having shot down every one of your arguments, I would assume you will change your conclusions.
Didn't think so.;-)
The antibiotic bacterial citation is assuming the DNA 'changes' took place whereas these previously may have existed in the bacterial population from the git go my friend. You do NOT KNOW what the original DNA pool of these bacterial agents was how could you since you would need to have had someone study every single bacterial organism's dna? You assume their were 'changes' made by mutations while along the bacteria that survive have dna that was there in the beginning.