[finnyspade]

It's not only your friends sharing when you don't want it. It's end users that own the router that want to share it. If you put yourself into your grandmother's shoes it may be less mindboggling. Security is all about securing content to the extent to which it is valuable. Many people would argue that their wifi password is not that valuable and therefore not requiring the greatest amount of security. Some people will find this feature convenient. It's for them and clearly not for you. You are no less insecure than you were previously. If you trust the people you give your wifi password to, then there's no issue.