I don't disagree but the Police get told many things by violent criminals, most of which are not true.
Yes doesn't cuff suspect, turns suspect over looking for stab wounds and the suspect takes out a knife and attacks said officer... we'd all be saying "why the heck did he believe him?"
Obviously in this case the poor boy was not violent or a criminal but they weren't to know that.
The evidence was there appeared to be no stab wound, they were responding to a reported racial attack, people who stab others, don't tend to hang around the scene of their crime.
Treating everyone equally is all very well and good but given many cases of racism and assaults within many Police forces, before any changes in recent guidelines, i wouldn't want to go back to what we had before.
Aside, if the Police had a recruitment problem prior to this incident, they certainly will have a huge one now.... who would want to be a copper now a days?
One error of judgment and you re toast.