Take the firearms away and watch the urban youth kill each other with knives, axes, clubs and fists. The homicide rate will remain high in the urban center until the cultural and moral decay is addressed and society begins demanding personal accountability. Which means as long as progressives are in charge urban murder rates will remain high no matter what weapons are banned.
They have done exactly what you said, in the UK and Australia.
And they have watch knife crimes, bladed weapon crimes, soar in these countries.
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