@Gianluca *****
Why should I? I am not your slave. When you
Jjust ask Google the question "is proof of onward travel needed for tourists in Thailand?" and you will get hundreds of links, none of them saying it is not needed.
You are literally the only one saying the opposite, just believe what you want.
If you are spouting complete nonsense, why would I provide proof that it is nonsense? That is waisting my time.