"Rich people do not really go to jail".
Oh yes, they do, ask Joe Ferrari or the Chairman of Italian-Thai.
"They will be found guilty. The then appeal and apply for bail (yes this happens in Thailand)"
Yes, that happens in most countries when appealing.
"You can run over the police in a Ferrari and be freed in Thailand.
If you have money".
As happens in most countries. Being remanded in custody is not something that usually happens after traffic accidents, even fatal ones.