These things are evenly distributed across society, but when overly targeting minorities it further marginalizes them.
Exhibit A) YOU might not be able to relate to people that routinely have a bag of coke on them, but a proportionate demographics of the population do.
Exhibit B) Silicon Valley openly brags about microdosing acid to perform at work at their half million $ jobs. Overpolicing would ensnare them if overpolicing existed in that demographic and then they would be ineligible for jobs the rest of their life. If you cant be subsidized by your family then you have actual crime to consider. Guess where you will live too.