And GNU folks would say the GPL is actually the more open choice because it forces the project to stay open.
Two different ways of thinking about it I guess... it's nice to have choices and I don't think one is more or less "correct", more a matter of opinion/taste I guess.
It kind of reminds me of the equality of opportunity people versus the equality of outcome people. One sets the starting conditions for developers, the other the ending conditions for users.
> more open choice because it forces the project
A true morality must be based on consent, not coercion. Humanity may not be there yet, and therein lies the argument for force (and thus copyleft); but the ultimate goal should always be to reduce its necessity.
I don't think the FSF would say that. They prefer the GPL, because it prevents someone from making a closed derivative, but I haven't seen them ever claim it is more open than "permissive" licenses.