No, it is not. It's basically torture.
"People suffer in these environments, experiencing a range of what can be severe, negative psychological effects, including forms of depression and hopelessness. Sometimes they become so despondent they attempt to take their own life. The highest rates of suicide and self-harm occur in solitary confinement units."
Ok, bring it down from days, there's this new hip thing called the internet where millions of people can do stuff from the comfort of their couch with results within seconds. You don't have to ban firearms, just bring up a registry and done. This is not magic, this is done with cars, it can be done with firearms as well.
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That's just how laws and regulations work, society coped with this mechanism for quite some time. Are gun-owners just snowflakes that can't handle changing environments?
Again, in the history of the world, this never worked. Harsher punishments never served the purpose of dissuasion. What keeps crimes from happening is a society that has overall a high standard of living, equal chances in life, and robust health and mental care systems.