Maybe that’s because they know they are also at fault. Yes, he was stabbed by someone, but the police themselves are likely the reason this guy is dead. He came to them dying, and they kneeled on his neck and handcuffed him. Vigilante justice would not only target the stabber.

It’s not sufficient to condemn vigilante justice. The justice system must be seen to provide justice in a timely manner.

To no one will we sell, to no one will we refuse or delay, right or justice. Magna Carta 1215

Justice delayed is justice denied. William E. Gladstone 1868 et.al.

Justice must be seen to be done. Lord Hewart 1924

What is the public to do if the justice system does not obviously deliver justice in a timely manner? What will the Hampshire Police Federation do?