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To your second point, I agree, safety locks do nothing to prevent premeditated murder. It's the unknown number of unplanned killings that may be reduced. And, of course, there's no real chance that something like this goes into wide enough use to really make any difference.
Couldn't find anything on how often the person who commits suicide is the gun owner, but even the common-sense step of taking family members who have recently expressed suicidal thoughts off the 'gun access list' would probably save hundreds or thousands of lives per year.
I have a vague memory of reading that the most likely lethal use of a privately owned gun is for a family member to kill him/herself. Grim statistic, if true.
Why do gun people insist on turning every conversation about gun safety into an emotional confrontation? This isn't really about your precious guns, it's about the tens of thousands of people who are shot to death every year. Discussing that it might be nice if fewer people were shot to death doesn't immediately mean that we're going to ban guns.
In personal life, people who inappropriate emotionally escalate conversations are usually trying to avoid something they'd rather not talk about. Can't help thinking that's what's going on here.
In 2011, 32,163 people were shot to death in the United States. 260 of those were justifiable homicides by private citizens (e.g., self-defense). Even if this technology failed and locked out the owner 100% of the time, and 100% of those failures lead to the death of the owner, it would only have to block less than 1% of the other uses to be a net positive. I can't find any stats on what percent of non-self-defense gun killings are done by people using a gun they weren't supposed to use, but even if it's a pretty small percent, this will save a lot of lives.
These Danish cyberbunker people seem to share a mindset with the U.S. Ruby Ridge crowd, and they're both wrong. Making yourself an immobile target and defying state power in a developed nation really only has two outcomes: either you're not enough of a nuisance to provoke action, or you get crushed.