1. Because without proof anyone can make any concept or statement and all of them will be valid, even the dumbest ones.Why does anyone have to prove anything?
Did he ever make the claim his concepts are right?
These are just ideas to consider, or not - the choice is yours!
All anyone need do is prove what works for them.
2. We can make an assumption that he do not want to spread false concepts.
3. Considerations may be flawed - so the expiriment is necessary eventually
4. Let them prove. That all what I want.