I'm a supply core undersergeant, so I literally went through lists of military equipment when I was serving. Never saw anything related to using antitank mines for improvisational demolition charges.
Just admit you don't have any reason. You can't rationalise it, but despite the overwhelming lack of evidence and logic, you still believe it. This is why Finland (or rather Finns) suck.
Blowing bridges isn't something you do when you're doing a tactical retreat. Blowing up bridges is something you do strategically. Guess you can't tell the difference, both synonyms to you?