> Most of the murders (homicides) in the USA are committed using illegal weapons

Hardly relevant. If you control guns better, you get fewer illegal weapons as well. Most of the murders in Europe are committed by illegal weapons as well.

> Banning legal weapons wouldn't reduce crime

Of course it would - see the reduction in gun violence in countries where this has been implemented.

> Besides, USA is not a good example. According to Wikipedia [1], high murder rate statistics in the USA are skewed due to the overrepresentation of one specific part of the population

Oh. You're one of those.

It's a peculiarly American thing to try first to look to race to try to understand something, when there are more salient correlations.

Presumably since Black Americans are overrepresented as victims of gun violence, you'd like to see a significantly higher proportion carrying guns?