Yep, they take a type of gun that accounts for only a tiny percentage of the problem, and that's what they attack, while ignoring the handguns which account for the large majority of gun murders. Nonsense!
Ah, but it will make them feel so much better for "doing something" about gun crime.
And they can mislead the public about so-called "assault weapons", and divide gun owners over the issue, then they have a chance of victory, even if it's a misguided victory. But from their viewpoint, any nibble at the overall gun ownership right, is worth doing. It doesn't have to be logical or factual.