You want or need something simply because you have the right to do so? We have the right to do many things (many of which are harmful) but I don't see how this alone is reason enough to do so, especially in the case of an assault rifle.
Is this true? Is so, then how do many other countries where assault rifles are not legal manage to live in relative peace? Those "Founders" also lived in very different times.
Anyhow, the article isn't really saying anything anyway:
While the NRA has used the memo as a warning of the administration’s plans, Joshua Horwitz, executive director of the Coalition to Stop Gun Violence, said the memo is an analysis about gun violence that doesn’t seem to indicate any sort of legislative plans by the government. The memo includes data on the frequency of mass shootings, gun violence, and the effectiveness of current legislation.
“It doesn’t appear to be a serious discussion of gun violence prevention policy, never mind an expression of administration policy,” he told AP.