Uhm, gangs killing people is certainly already very much illegal?..how do you plan to dissolve the problem at its root by legislation, exactly?

And how many lives are saved by guns vs taken away by said guns? There's a reason almost every single country on planet Earth has decided to outlaw firearms for self-defence.

If we want to reduce violence and save lives, we not only need to work with the problem at its core - it's essential, but not enough and doesn't deliver the results you dream of - we should also remove the means by which said violence is executed as much as possible to curb violence now.

Your "right to self-defense" is paid by lives of people who were shot with legally purchased guns in a criminal attack. Everyone carrying guns, overall, does not make country safer, which is a thing just about everyone realized like almost a century ago.