This is a neat explanatory theory but it is only one potential explanation and the reason that the modern movements that are predicated upon it are so dangerous is that it is treated as though it is the only explanation.
>It turns out that one of the likely reason for their disproportionate encounters with Police is their disproportionate socio-economic situation
There is absolutely nothing outside of correlation to indicate that this is a "likely" reason. The influence of a totally broken culture is drastically understated in socially acceptable discourse. This disproportionate rate of police encounters is unique to blacks and not nearly as prevalent among virtually any other low income socioeconomic group. It's trivial to blame injustices of the past (which plenty of other groups have experienced to various degrees) but even discussing the necessary, drastic change in culture required to solve this problem is taboo. And, ironically, such a position is incompatible with the modern progressive framework, within which such a solution would be seen as whitewashing or gentrification. And rightly so, ghetto black culture is inseparable from glorification of crime and violence.
So instead we blame the issue entirely on "systemic racism", the only proof of which is disparate outcome, and the solution will invariably lead the rest of society to suffer the effects of rampant criminality before leaders from black communities will, as has happened repeatedly in the past, later switch to complaining that black communities are underserved by police services, starting the cycle anew. Biden's now unpopular crime bill, along with disproportionate penalization of crack, had strong support from black leaders and black politicians, but today's ideologues class them with the same boogyman of so called systemic racism.