That's a weird argument. I'd say that most people who make (and use) bombs are bad people in that they make them and they deliberately use them to kill. I can't be arsed to look up the numbers but I'm willing to bet that they are significantly fewer than the people who use firearms to kill their fellow human beings in the US. Significantly fewer, as in a factor of hundreds or thousands.
Now, are you saying that if the existing gun laws in the US were followed to the letter, only roughly the same (or comparable in at least some sense of the word) number of people would still be killing others using guns?
That is a novel argument, I'll give you that, but seriously?
One of the problems that Democrats have when confronting these kinds of issues after a tragic incident is that they find that any remedy they offer is met with "Those measures would not have stopped this tragic situation" and they are right.
Chicago is a gun free zone. So there is absolutely no gun violence there....except of course there is.
People are not allowed to purchase and own guns if they have a history of mental health problems and/or a criminal record...except they somehow manage to both purchase and own guns.
THIS is precisely what I mean. Ban guns like Chicago did and what is the effect in Chicago. Honestly, do you think that will work in America and based off what is and continues to happen in Chicago...how? That too is IF you could foment enough support to get around Constitutional rights and such.
So presuming that this is NOT going to work AT ALL, we go to the very next step which is to say "Most people do not step out their door and start firing at everything the moment they leave their house. Who is responsible for the mass shootings and who is responsible for incidental gun violence, What type of people? What makes them different from the majority that do not. How can we prevent these kinds of people from hurting other US citizens?
Criminals and mentally ill are two huge flags. Proportionally these people make up a HUGE amount of the amount of both mass shootings and incidental gun violence. So stop these people and the effect on gun violence will plummet without the majority of US citizens who are not criminal nor mentally ill.
It is a pretty easy logical flow. Unfortunately what I see happen too often is that an incident happens and people get outraged and call for demands that are easily countered as unhelpful as they would not have addressed the problem at hand OR they call for call for Australia style buyback or gun restrictions which goes precisely nowhere because of the Constitution.
I also see that time after time criminals and mentally unfit people get to own or possess guns and often are sold by people who ought to have known better and /or did not check properly OR there has been a database glitch.
Enforce the reasonable and practical laws well and police and audit such places to get better controls, get illicit firearms from the criminal population and it will make the same difference in the same way that removing public rubbish bins in London removed a big inconspicuous hiding place for the IRA when it came to the spate of bombings in London. Practical moves to reduce occurrences.