Though it's still not a sufficient correlation by itself either. More info is needed. Was the number of permits the only thing that changed that could have led to the decline in crime? Maybe other measures were taken like more police patrols, CCTV, shrink of population size and so on. So while it's not necessarily wrong to say that more carried weapons mean less crime it also is no proof. We have to look at the whole picture to see what influences what.
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Putting Germ back into Germany. 
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