That's why for example, the US hispanic murder rate is 1/3 that of the black murder rate, while hispanic poverty is quite high (most of the US hispanic population is sub 40 years old in terms of its existence in the US, and most hispanic immigrants were poor and with low skill levels when they came to the US). It's very clear that poverty is in fact not the primary cause, it's the collapse of poverty support systems in the cities in question (call it basic human infrastructure, or something). That system collapse leads to extreme desperation, which rapidly erodes a culture, which feeds on itself (~93%-95% of murders in St Louis are black on black murders for example), which prompts a vicious circle that becomes very difficult to break.

Cities like Baltimore and Detroit are more like failed states, to so speak. They've generally suffered total breakdown in the neighborhoods seeing these incredibly murder rate numbers. For example, the Baltimore murder rate comes across as shocking at 55 per 100k. When you drill down further, it's far worse than that, because those murders are isolated to a small percentage of the city, neighborhoods that see dozens of murders each year. These are neighborhoods that have suffered total collapse, their cultures have been destroyed, support systems are no longer existent, and almost everyone is universally afraid to go near the problem (both literally and figuratively). Simultaneously in eg Baltimore or Detroit, you have very scarce resources to go around, the collapsed neighborhoods killing themselves are not going to get those scarce resources. As cliche as it might sound, it's very simply a downward spiral (and as one might expect, to break that, is dramatically more difficult and costly than to just maintain a healthy context in the first place).

My suspicion is, the best way to fix failed cities like Baltimore, is direct, temporary Federal takeover, on the basis of a national interest. I don't see how it makes sense to pretend a city like Baltimore is an independent, functioning city any longer.