You need to be extra careful with airdrop coins, especially those with desktop wallets. They can be infected with viruses / keyloggers in an attempt to steal your wallet keys. That's not always the case but worth making a point.
Agree and that's why I avoid AirDrop that requires downloading their wallet unless they are really checked. In any case, before you participate in an AirDrop always search this forum and read what others think about him.