Because that is the most common time it matters, I could say we need all the guns we can get for the purpose of someday overthrowing a tyrannical government and be just as justified.
That's not the only time it matters.
Gun ownership matters when people are killed by accidental discharges. It matters when police officers are approaching a car they've pulled over and are assessing the risk of the people in the car. It matters when
a concealed carry permit holder decides to unload at fleeing shoplifters in a Home Depot parking lot filled with shoppers. It matters when a gun owner has a suicidal thought that would have quickly left his mind if he didn't have an instantly lethal weapon.
Gun ownership matters every single time a person is killed or injured by a firearm. It matters every time a gun is fired in a public place or a home.
By any reasonable measure, just by sheer body count, the most common time gun ownership matters is when someone takes their own life with a handgun.
If you support successful bans on guns for personal defense you take active responsibility for every crime that could have been prevented if the victim had a gun.
Nonsense. The state does have a responsibility to prevent crime in a general sense, but this a separate issue.
They are somewhat so, but that was the point. Simplify it down to the essence, if a gun takes a life or I refuse to own one, I have the responsibility of the choice; if it is denied and needed it is the responsibility of the denier. If a law, the government, and, if a democracy, you and me.
And if the denial is justified, then the responsibility is satisfied.
Are guns like the ring of sauron now, that they effect others? Do they whisper of the dark lord's promises and convert good witches and wizards to dark arts? Guns don't effect people, people effect people. I feel like that is similar to something else I've heard...
More bad pro-gun arguments, maybe?
This is hypocritical on your part. The argument you've given so far hinges on the ability of others to take your life. Do you really think that a violent criminal coming at you with a gun is really no more dangerous than a criminal with empty hands?
Because the increase risk of suicide associated with firearms is well known and foreseeable. Those who arm the suicidal can reasonably expect that their actions will result in more deaths, so they share responsibility for their deaths.
I don't see how proposing that people are incapable of utilizing a necessary tool is the same as saying it isn't necessary.
"Necessary"? I notice a theme in your oversimplified hypotheticals: you assume these omniscient gun-owners who can tell with certainty when they will die if they don't act, and who are clairvoyent enough to look into the future and divine that the available options besides putting bullets into another living person won't be successful.
Do you think that ALL people are magic, or just gun-owners?
Back to your immediate point: even setting aside the ethical issues that would be there even if the gun-toter was perfectly trained and skilled, if the gun-toter isn't trained enough to reliably create the dubious "benefit" of killing the person who they feel threatened by, and if their lack of thorough training creates additional risks for themselves or bystanders, then this changes the balance of benefits and costs.
When deciding what the effects are of
That is an odd qualifier that was never discussed before and makes little sense.
I don't accept your assumption that these people carrying around deadly weapons and looking for a fight are "peaceful". Their behaviour seems contrary to the goal of peace.
None. If I am actively imperiling their lives? I'd say I can't think of one that I retain against their attempts to stop me.
How much risk constitutes being "actively imperiled"? If my neighbour carries a loaded gun when he's out and about in my neighbourhood, he's increased my level of risk. How much of an increase in risk would warrant me stopping him - or using the law to stop him - from doing this?
You've argued that actually pointing a gun at someone warrants taking a life; what does merely brandishing a gun without pointing it warrant? What about carrying it in a overt way? If our response is proportional to the level of risk, what do these actions warrant?