With the freedom to act comes the freedom to act in your own self interest, selfishly or for good reason or to act stupidly.
I don't see it as "playing into the anti's hands" since s long as there is a demand and profit on the line manufacturers will produce more. It does serve to show the folly of future legislative limitations. If it scares the antis that isn't much of loss anyway.
Anyone "on the fence" with any sense just might realize they had better get off the fence and get armed, those without the sense to figure that out are probably latent antis anyway.