How do you think the 2nd amendment is under assault? If you look at the list of things our youth were marching for[1], it doesn't say anything about taking guns away. Just like you can't yell "fire" in a movie theater, you shouldn't be able to walk around with a rocket launcher or semi-automatic weapon. Also, there's no way in hell any group of citizens can fight the US army these days so it seems like a moot point. You don't need automatic weapons to defend your house from intruders, but for some reason our leaders tell these kids that the solution is to shut up, wear invisible back-packs and learn CPR.
[1] https://marchforourlives.com/how-we-save-lives/