I actually disagree with both sides on the issue of guns, specifically the proposed assault weapons ban. It won't work the same way in the US that it might in New Zealand or Australia, and there are a few reasons why.
The first is that there are already more guns than citizens in the US. Too many people have too many guns, and making them illegal isn't going to solve the problem. It will just turn a lot of law abiding citizens into criminals overnight, which is shades of Prohibition or the War on Drugs. This is not something that can be safely or effectively enforced, because it would pit law enforcement against citizens with guns, which would escalate the problem of police violence. The vast majority of gun owners are little more than hunters, hobbyists, and collectors; not terrorists. Criminalizing them would paint them all as terrorists, for the actions of a few, and that's not something I could ever support.
The second is that assault weapons are very poorly defined. The most popular gun classified as an assault weapon is the AR-15, which depending on the caliber of round, is actually a low-to-medium powered weapon. If you ban those, people will just go to the next most popular type of rifle, which is typically a 30.06 hunting rifle like the M1 Garand. Hunting is one of the main reasons people own a gun, hence its widespread use. A 30.06 is a high powered round, and if a mass shooter decided to use them by firing into a crowd, he wouldn't just kill those in front. He would kill the entire line of people in the path of the bullet.
The third is that such a ban would make the problem it's trying to solve much worse, by driving guns to the black market where they can be produced and purchased much more cheaply. The military full auto variant of the AR-15 is the M-16. You can legally purchase an M-16, but it costs more than ten times as much as the semi auto AR-15. If these guns are pushed to the black market, the manufacturers are going to favor the full auto receiver of the M-16, which would certainly be deadlier than the AR-15.
The fourth is that, in terms of policy, an assault weapons ban amounts to a tiny bandage on a gaping wound. The actual reasons for gun violence in the US have to do with toxic masculinity and the ingrained belief in our society that the gun makes the man. This is a cultural thing, primarily driven by our heavily militarized society. In the US we're brainwashed into idolizing the troops and supporting every war of aggression the US wages. This is the reason the AR-15 is so popular, because it's similar to the M-16 used by the US military. It makes you look and feel like a soldier defending freedom, which is just a stupid power fantasy. Consider how every corporate media outlet endlessly pushes war propaganda. Consider how every establishment politician preaches support for the troops. Gun violence is framed as a goal to which young men should aspire, and not a harmful outcome to be avoided.
I'm saying all this as a pacifist who doesn't own any guns, and should never own guns because of my mental illness. I don't have personal stake in this political dispute. But I care about the rights of others, and don't want to see half-measures that would only exacerbate the problem.
The best way to curtail gun violence is to rein in the main perpetrator of gun violence in the world, which is the US military. End the wars.