

Unfortunately true. It’s disturbing to see the non-policy-related causes from that page:
Police discrimination (a crime)
Vandalism (a crime)
Discriminatory housing practices (currently a crime)
Gentrification (a market effect)
Supplemented with actual policy change. They don’t need the help.
In this age of ubiquitous phone cameras and instant social judgement, I look forward to the backlash as racists reveal themselves.
Look instead for the reported causes. The effect “is sundown town or not” might be difficult to conclusively prove or disprove. The causes are sometimes documented though.