Yeah, but killing people also goes against freedom.

The license doesn't say it must be used to promote freedom. It just says the users must have certain freedoms. Those are two very different things.

To be fair, there have been legitimate freedom fighters whose battles would be considered just by many of us even if blood was spilled.

I'm not sure how de-arming would help the US right now, but I understand that there are a lot who would argue that the US has too many weapons (as opposed to having any at all).