What is causing the killings in Chicago and other US Cities?

US Headlines:

56 shot, 8 fatally, in Chicago weekend (Aug 2021)

Philadelphia on Sunday surpassed 400 killings within its borders(Sept 2021)

Baltimore hits 250 homicides for 2021((Sept 2021)

The Prophet Muhammad ﷺ said, “A time will come when the killer will not know why he is killing and the killed will not know why he was killed.”

What responsibility & accountability do we have as Muslims on stopping these killings?