IMHO, morality follows sort of a bell-curve. The average (majority of the bell) tend to agree on what is or isn't moral according to common scenarios. However, there will always be outliers.
Left vs. right-wing thinking tends to correspond to the outliers. The left are called "bleeding hearts" for a reason. Take Roger Waters, for instance. His bleeding heart is so extreme that he fixates on the suffering of what he perceives to be "underdogs" to the point where he spends
all of his time feeling compassion for terrorists and none for victims of islamist terror.
The extreme right is so fixated on order and keeping the peace that they are guilty of supporting police-state conditions as a means to an end.
Anyway you slice it you're talking about the push-pull of empathy vs. security.
If you feel less secure, you reduce your empathy and shift more towards a seige mentality. If you feel more secure (i.e. rich senior-age rock stars like Roger Waters) then you can afford to whine about each and every bit of collateral damage.
But you can see how all this points back to
environment. The more prosperity, the more security, the more you can begin to trust thy neighbor, so to speak. The less prosperity, the more crime, the more things revert back to a tribal system, like Crips vs. Bloods in the inner-city or the various sects that tend to their own in the worst places of the Middle-east.
I have learned, as per above, that prejudice and generalizations serve an evolutionary purpose. All decisions you make are based on probability. The SJW infestation that infiltrated, let's say, the security aparatus of airports made us LESS safe by having us pat-down little-old-ladies and pass through swarthy middle-easterners rather than make a judgment call based on demographics/appearance.
The left's fixation on political correctness is a luxury of living in a relatively free and easy society. In a world with rampant crime you can be damn sure that people would begin to mentally profile who looks suspicious and who doesn't, PC be damned. Security trumps virtue-signalling.
So again...ENVIRONMENT ENVIRONMENT ENVIRONMENT.