Appealing to fear? How about using logic? You don't know the future, or are you a wizard of some sort? How do you know what he has already planned for or hasn't planned for? All that matters are the rules & who applies them in each case using discretion & so any person could technically be denied entry & it's up to the individual to maximize their chances. "A tourist isn't someone who lives in another country"... utter rubbish in terms of Thailand's laws & the dictionary doesn't back you up either when you consider we aren't talking about permanent residence.