Why are you so convinced of the Police's guilt? You appear to be completely ignoring the fact that there is a specific problem with black drug and gang related crime.
Simple, investigations and reports indicate that that is the real problem. Addressing the symptoms without addressing the real cause exacerbates the symptoms. It's like pouring petrol on the flames. For sure, you can put out fires with explosives, but at what cost, in human and financial terms.
Those same investigations and reports indicate that BAME people suffer structural inequality, poverty, poor housing, reduced opportunities, discrimination, and racism, and that sort of society creates criminals. How can it not? If you alienate a whole section of society, what do you expect?
Those victims of society are invariably the ones who suffer the most in terms of poverty and from discrimination, especially from the very institutions set up to protect and serve us.
Without addressing the real source of the problem, and instead only addressing the symptoms, it is a downward spiral.
I'd hazard a guess that if we go back 50, 60, 70 years, especially in London, the majority of criminals were white, career type criminals. including violent crimes.
I suspect that the amount of crime may have diminished since then, but the type of crime has changed. Society has influenced the type of crime that is now perceived as the most prominent. I say society has influenced the perception, because knife crime may not be the most prominent or prevalent, but regular media attention has created that perception.
Additionally, as the inequality, poverty and discrimination in society creates criminals, crime and criminals always find ways to exploit the weaknesses of, and in society, be it drugs, greed, corruption, hate, division, etc.
I'd also hazard a guess that the majority of crime now is so-called 'victimless' crime. Such crime (excluding shop lifting) is probably not motivated by poverty, but by greed and corruption. But because it is more sophisticated, and the investigations more prolonged, and more international, it is less 'news worthy' to certain tabloids.
Finally, yes of course we should seek to eliminate such violent crime as knife crime, we owe it to the many parents of murdered children.
But let us not concentrate on the symptom without addressing the real cause. And also recognise that some poorly executed attempts at eradicating knife crime may exacerbate the symptom.