President Biden is misinformed. Like many gun control advocates, he is arguing from an emotional platform, not from solid knowledge or logic.
It may be that banning the private ownership of firearms will bring peace to our society, but that is a different discussion.
Any firearm can be lethal. A huge number of gun related deaths come from little .22 caliber pistols. Banning just one cartridge won't do anything to reduce the weekend death rate in Chicago or any other major urban area.
The relative effectiveness or lethality of the various cartridges has been long discussed in law enforcement circles. If you want to know more, just access YouTube.