I do not know any country that has police force more respected for its professionalism and incorruptibility than that in the UK. Having traveled extensively throughout my life I think there is a very good reason for that. If I am wrong and others can provide an example I am happy to be corrected.
It does not mean that they are 100% infallible, do not ever make mistakes or do not have crooks in their ranks. Suggesting that unless they are 100% whiter than white they are crooks, corrupt or callously going around killing innocent people stupid or a deliberate policy to amplify mistrust.
There are plenty of cases of trial by media. And (maybe) rightly so, there is definitely a place for independent investigative journalism in a democratic society, but on this case I will reserve my judgement until proper investigations are concluded and their findings are presented for public scrutiny.
Riots were not "sparked" by the death of this person but by inaction of the police, which showed that criminals can attack people, break into the shops, loot, set fire and get away with it.