I feel as though this isn't that surprising when you realize that for most municipalities police forces are revenue generators. Meaning that their main job is in increasing the funding of the precincts they belong to by issuing tickets to traffic violators. You could go a step forward and say they are systemically incentivized to target specific groups due to them being perceived as outsiders but I think a lot of police precincts still enforce broken window theory.
Pretext stops don’t generate ticketing revenue. They’re used in the hopes of finding more serious (by law anyway) crimes once they’re able to get a closer look.
3/4 end with warnings or no action. They’re not pursuing dangerous drivers or fines, they’re pursuing targets they think they can escalate to more serious charges (such as weed possession, in other states anyway)
