With regards to the OP, our police system is embarrassingly bad and I’m not sure what the solution is. Qualified immunity and those strong civil service protections need to go. Very stiff penalties for tampering with cameras and intimidation of witnesses need to be implemented. That would be a start.
Anyways these police murdering people and police brutality incidents are far too common and are literally sickening and I feel terrible for the suffering that that man and his family went and are going through.