Farm Bureau of Tennessee They cancelled my policy Columbia Tennessee

I have been a member with Farm Bureau of Tennessee for many years and have always had my auto insurance with them. Recently, my son was staying with me short term and his car broke down. Trying to do the right thing, I contacted my insurance agent in the Kingston Springs TN office and asked if I could add my son for just a month, since he would be moving out in 3-4 weeks. I just wanted to cover him in case he needed to use my car. I was told that due to some issues with his driving record, they would not be able to add him. I said ok and let it go. A few weeks later, I received a letter in the mail from Farm Bureau stating they were cancelling my policy because it was too risky to continue my coverage with my son staying in my home. By this time, my son had moved out. I again called my agent and told him that my son had moved out of my house. I was told that I could not have my insurance reinstated until I sent a copy of my son's driver's license and a copy of his insurance card to them. I don't see how a company can just cancel your policy under suspicion of someone else other than yourself driving your car.