And a lot of atheists wouldn't take offense to you sending such a card. Even Dawkins didn't take offense to people praying for him. He said that it wouldn't do any good, but he appreciated that people were thinking of him in such a way. Could someone be a real bad actor and do something unkind with this? Sure, but they can do that with anything. Should we shut down the internet because people can use it for distributing and consuming child pornography?