No, they do not think anyone will check 'Yes' to that box.
The purpose of the box is that it's a crime to lie when someone checks 'No', and that tends to be an easy charge to bring.
So, the purpose of the form is to generate convictions for lying on the form.
Yeah but if the immigration officer has reason to question you about those sections of the form then surely they have more than enough evidence of the underlying crime anyway ?
Lying on a customs form is a valid reason to revoke a visa, and it’s an open and shut case.
It basically unlocks a second set of potential facts that they can use to bring a criminal case (or revoke a visa, etc).
Instead of politics being about setting policy to work toward desire outcomes, politics becomes about ensuring the viability of future political processes. Instead of the legal system being about defining crime, establishing punishment and carrying out said punishments it becomes about ensnaring others in legal "gotcha" moments like lying on a form. Society is not safer because of the outlawed nature of lying on a form. Society is not better off because someone is convicted of lying on a form. The individuals who participate in the prosecution are better off because it gives them an opportunity to advance their career.
You sure about that? Many other countries have what would be considered odd questions on their forms.
Also, saying "every other country" is a mighty wide brush. There are a whole lot of countries where the rule of law doesn't come first and they can simply do what they want if they suspect you of anything regardless if they have a law or not.