You seem to be confused as to who is in what “camp”. Only camp I am in is the one interested in answering this question:
Can states, via their inherent police powers and subject to their own constitutions, enact laws regulating the possession and use of arms?
The examples listed - whether good policy, bad policy, or whatever - demonstrate that the answer is yes, because states clearly believed they could pass such laws, and did.
That’s it. That is the meaning of listing the examples. They don’t help you - you took the position that statws didn’t regulate in this space prior to the 20th century. That is incorrect, they did. Did they enact fewer regulations? Sure. But that isn’t relevant to the point whether states had the legal authority to do so.
And with respect to Nunn v. Georgia, that doesn’t help you. That is a state court deciding the issue, and as such, the decision is subject to - that’s right - being overruled by the state legislature (by amending the state constitution). Point? States are in control for their own state - Georgia handled it their way, other states went a different way. It is up to the states to figure it out, and each has the in her power to do so.
*Further on this point, Nunn v. Georgia - which didn’t strike down concealed carry laws - was effectively overruled by Strickland v. State, in which the Georgia court held that the state may require persons to register their arms. But that is neither here nor there to the point - what matters is this is a further example of the state deciding how firearms will be regulated, through policy and law.
One thing you said I think is somewhat right - gun control has been more pervasive in the 20th century. That makes sense - with the risen of industrialization and the phenomenon of people moving in closer proximity, new and more prevalent public safety challenges came with them. Same policy reasons some state passed laws restricting the amount of gunpowder you could have at your residence - with people and property in such tight proximity, states felt the need to try and prevent accidents from affecting the public at large. That same policy and precedent applies to 20th century laws, as states had to deal with growing problems of a similar stripe.
Were those laws overreaching? Bad policy? Good policy? That is a topic for a different time. On my point I am trying to make is that the states could pass such laws, not whether they should have.