@Siggi ******
Then you just did not learn enough during those 5 years.
He might not be able to force you to show bank statements, but he can ask you to show because it might be relevant to check if you are allowed to enter the country.
When you don't cooperate he just can refuse you entry.
The same when you apply for a visa, you do not need to show bank statements, but the result wil be the application will be rejected.