Hey, some of those cards might have had money in them!
This may seem like a huge embarrassment for the country singer, but like every major celebrity, her underlings probably hand-select only a few pieces of fan mail for her to unceremoniously throw away every day. She doesn't have time to not even open all the letters her fans send her. Plus, who writes fan letters to Taylor Swift anyway? We only write to Bon Jovi, who definitely opens, reads, and treasures each of our handwritten missives.