Change a few words and it sounds like an article posted in a southern newspaper in the 1950s responding to criticism of segregation and lynchings
I don't believe I've seen anyone prominent - no one outside the odd "Lost Cause" crazy - that has materially objected to the subjugation and violent crime committed by southern whites against black people.
What is largely objected to, reasonably, is the inherently subtle, and occasionally not-so subtly implication you’re making - why is the white southern crime rate higher than the white northern crime rate.
One can either attribute that to some as yet unknown racial or genetic factors - that whites in the north are somehow “better” than whites in the south- that they’re just bad parents, don’t discipline their kids, that white southerners are just bad at stuff, and because they’re white southerners, they’re more likely to murder, oppress others - etc. This, depending on what action you wish to take on is just thinly veiled bigotry, and in cases were you just openly denigrate an ethnic group for being inherently bad at some current social measure than northern whites that veil is largely lifted entirely. Indeed, terminating your superficial search for why’s at behaviour you can attribute to the nature of the individuals themselves without looking any deeper is often used as pretence to oppress people and to justify open bigotry.
Alternatively you can attribute it to complex sociopolitical factors; many of which have historical economic components. For example things like, say, the social impact of the reconstruction and the destruction of the southern economy - caused in part due to overzealous northern prosecution of the war and historical and modern day tariffs, poverty that resulted in the collapse of family structure in many poor white southern communities; which in turn can fuel crime and race hatred - as abuse, poor parenting, and broken families are one of the most substantial correlates with crime in the us.
Group behavioural trends are the incredibly complex interaction of innumerable factors, with genetics being a largely minor player in the churning mix. Add into this generational impact of various sociopolitical factors: if parents are exposed to some negative impact, it may impact their children, who can then impact their children - and on and on.
It’s almost impossible to draw causal conclusions from correlating this data - especially given the glut of data from a variety of locales and times that indicate the wild variability of murder and violent crime rates sliced across everything.