The argument is that firearms are purposed primarily as weapons. You use them against people and animals as weapons. Second, their existence as weapons primes aggression in people to use them as such.
Saying they are used for sports (including hunting as a sport) is irrelevant as the 2nd Amend. is not about sport. The target sports are derivative of the weapons usage. Next, the sporting argument was used in Australia and the UK for a reason to have guns. It failed. In the UK, before their ban, the gun sporting organizations used to mock the humanoid targets used in IDPA and IPSC for demonstrating our blood lust.
Here is the 'sporting' use attack on the RKBA from a responsible gun owner -
https://www.nytimes.com/2017/10/07/...t&contentPlacement=1&pgtype=sectionfront&_r=0
The author is a gun owner in a pleasant and safe enclave in Oregon, who might go hunting. That's the model for the responsible gun owner. No mention of self-defense or defense against tyranny.
Thus, denying the purpose of the firearm is a useless attempt to defend the RKBA. The right exists for them to be weapons. Other activities are side effects.
Now, can you sue companies and store for providing weapons? That is the issue. The argument is that their mere existence causes harm. The aggression hypothesis is debatable in the scientific literature and the devil is in the details. If a store or company breaks the law in selling them (as some gun stores - small percent) seem to have been, they are liable IMHO. However, if the gun is purchased legally, then can you sue because it exists as a weapon and used as such.
That is what the anti folk want to do. They also will claim that the potentially destructiveness of one weapon as compared to another is a cause for a claim. If you only had a O/U ducky-wucky gun, you couldn't produce such horror. You know that a bump stock or 60 round Surefire mag can do that and are they attractive nuisances as they attract folks prone to do such.
You might argue that you need such for self-defense or defense against tyranny. Make the case. In our own threads, we see folks state:
1. 5 is enough
2. A pump shotgun with 5 rounds is all you need for HD.
3. I am not competent enough to use more rounds
Interestingly, the shotgun mantra is echoed by Joe Biden. On SNL, a comedian said that why do you need more than 6 rounds? If you can't do the job in six rounds, learn karate. In one thread, some poster said the exact same thing - if you can do the job with one round, you ain't doing the job. I heard the same crap in a good ol' boy, let's posture gun store in Austin from a clerk with the body profile of the Hindenburg.
Thus, you need to not try to mitigate the weapons use by appealing to sport. Saying they are just a tool is flat out stupid as that avoids the agency and purpose of the firearm and the 2nd Amend.
Protecting stores and companies who follow the law should be a primary goal. Getting rid of that is a way to destroy companies. Does that happen? Sure, it does - American Derringer in TX used to produce a full line of guns. I read that it was reduced to almost nonexistence by a law suit from a cop who dropped one or somehow ND'ed and they didn't have the resources to fight the suit.
Are there limits on available weapons - an old debate. Should you have a nuclear weapon? Is the BOR a suicide pact because of allowing some unfettered risk?
You can weaponize Anthrax - as a terrorist did in the USA. Is that protected as 'arms'?
Folks are correct that the push to legislation has an end goal of total bans. It is not a small correction that bump stocks are stupid and bought by idiot fan boys. They are not needed for the purpose of the 2nd Amend. and thus a regulatory look is warranted as they exist as an attractive nuisance with little purpose. However, a small fix in regulations won't cut it.
The goal is an expansion of bans to reduce guns to the responsible gun owner paradigm. Reading various sources and watching commentators - we hear:
1. We should ban all semi-auto guns (WaPo - but they did have another OP-ED saying bans were stupid)
2. The problem is that we have 300 million guns and we need an Australian buy back (confiscatory in nature).
3. You don't need an assault rilfe with a 30 round clip of cop-killer bullets to take your 8 year old son hunting (a paraphrase of Morning Joe - a waste of organic matter). BTW, he denounced Trump (merits of Trump are off limits) for saying the police's quick response to the Vegas shooter was a miracle. Why - because it took 72 minutes till they breached. That isn't what happened.
Hope I touch on the comment about suing companies and stores in this long exposition.