Since America is the only developed country where mass shootings are this common, is it true there's no way to stop mass shootings?

Yes. More organized shootings today. Much more violent crime in the 80's.

Cocaine and the drug cartels came to power. Gang warfare. Large cities were considered very unsafe.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.