I would love to be a fly on the wall when someone tries using that excuse in a war zone xD In a way I'm thankful for it. It means that most people never even came close to real consequences of their actions...

Stupidity isn't a valid excuse against treason charges.

I'm not sure how the legal system in Ukraine works but for criminal charges you typically you need to prove intent. "Stupidity" would probably be a valid excuse in that case because it implies lack of intent, at least pertaining to the charge of betraying the country.