Because there's a lot of grey area between those binary states, and plenty of examples of the GPL being used for good and/or evil to various degrees.
Either the GPL is sufficient to keep participants harmonious or it isn't.
You could say I'm arguing that the GPL isn't enough to keep participants harmonious, and therefore accepting the binary nature of your claim... but in the context of your post, I think you're conflating the GPL with all kinds of other social interactions in FLOSS projects, and carving its impact into binary positions can't give you an answer based on fact and experience.
Because there's a lot of grey area between those binary states, and plenty of examples of the GPL being used for good and/or evil to various degrees.
Either the GPL is sufficient to keep participants harmonious or it isn't.
You could say I'm arguing that the GPL isn't enough to keep participants harmonious, and therefore accepting the binary nature of your claim... but in the context of your post, I think you're conflating the GPL with all kinds of other social interactions in FLOSS projects, and carving its impact into binary positions can't give you an answer based on fact and experience.
(phew)