They don't "always believe this", this will lead to your account being banned eventually, or at least barred from returning products.
I've been a prime account member in good standing for over 5 years now.
I order thousands of dollars worth of stuff every year.
They're not cancelling my account. Ever.
They seriously don't give a shit. They're not paying these costs. It's all covered. They are not the same company who delivers or insures.
They are for-profit corporation, not our government.
There's a difference.