Comment by kelnos

> It allows free use but also protects the society from free riders.

That's a value judgment that others may not share. I'm not (quite) one of them, but there are people who believe that bits on a hard drive shouldn't be owned, by anyone. I think it's a perfectly reasonable stance to argue that releasing something as a public good under the least restrictive terms possible is a moral and correct thing to do.

Personally I prefer strong copyleft for most projects that I really care about. But that's my preference, and I don't kid myself into believing that I know what's right or wrong for society in this area.