Why would anyone want to use lightening when they can do on chain transactions?
Because, for a small payment, the on chain transaction will be too expensive. That is exactly what we want. I do not want kiddies paying for a Hamburger on our blockchain!! They can use LN for that...
Why use a bicycle instead of a car?? Why do you pretend to be stupid?
I can't tell if you're being sarcastic or not.
You WANT on chain transactions to be expensive? If you really believe that, you've been brainwashed by Core. This is just basic common sense: people will rather pay less than pay more for the same thing.