Can GMAC be liable for letting someone commit fraud on a credit life insurance policy?

Dad bought Tahoe at GMAC, they (dealer, who he's known for 30 years) knowingly new he had all the conditions listed on application, but still let him apply anyway. Dad passed 8/09/06, so now credit life sends forms wanting to know all health problems. If had none of the problems, then car would be paid off, otherwise my mother will get back the $2,220 the price of policy. Somehow shouldn't GMAC have fraud charges on them or some kind of consequence. Besides the dealer, the financial person also knew that he had all the illnesses. How can they let someone apply, knowing if they have any of the illnesses they will be denied and if they answer no to illnesses and credit life wants a medical history on applicant, which then applicant can get charged with fraud.