I already have auto insurance, so why is Europcar forcing me to buy it for my car rental?

When Allison Blake rents a car through Hotwire for her trip to Mexico, she is forced to purchase auto insurance coverage even though she already has it through Allianz. Can our advocates persuade Hotwire to refund Blake the cost of the insurance she didn’t need?

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I already have auto insurance, so why is Europcar forcing me to buy it for my car rental?