It looks like the black WI driver who mowed people down in the parade was a criminal who worked alone who had anti-white propaganda push him over the edge.
The black NYC shooter may have worked alone (doesn't look like it). I think he was a mentally ill man who was pushed into it, like the Sandy Hook shooter.
No tit-for-tat attacks on blacks as of yet though. If there is one, fully expect the full weight of the system to give the Alex Jones treatment to the race realists (or outright racists) over at VDare and American Renaissance and conpro.win and lots of other sites/commentators. Even normie(ish) conservatives are making 13/52 comments these days, like Mark Dice, and race realism has gone mainstream.
My hypothesis is they are trying to prompt a retaliatory attack, but one that won't fall apart under scrutiny like Jan 6th Reichstag Fire or the MI gov kidnapping entrapment.
Of course, I really can't test this hypothesis, so it's more of a theory really.
Yes, crime rates were much higher in the 1960s and 1970s. Murder rates, and crimes that tend to get reported regardless of police presence were higher.
The case has been made that legalization of abortion played a role in the reduction of crime, as well as the "broken windows" model of policing, and the large increase in the prison population due to the 1980s drug war and the tough on crime laws passed at the time. Really, it's likely some aspect of all these things mentioned, but how much weight you can ascribe to each we can't say.
What we can say, is after the de-policing of inner city areas after the Ferguson riots, the murder rate has gone up and up.