It's a good idea and I definitely could see it being adopted by Law Enforcement.
However, this will do absolutely nothing to prevent accusations of police brutality and hate crimes because unfortunately it seems as though the vast majority of the accusers care little for the circumstances of the shooting, arbitrarily labeling any police shooting as an instance of police brutality or a hate crime to fit their agenda.
The gun cam may help justify shootings in the courtroom, but out on the streets it seemingly makes no difference whether or not the shooting was justified because the guy who got shot will always be pushed as a pillar of the community who would never hurt a fly with all evidence to the contrary being written off as circumstantial or planted to fit their agenda, and obviously the many folks with persecution complexes will happily eat up such rhetoric because it supports their lifestyle.

If the current situation in Seattle has taught us anything it's that certain folks (namely those of the criminal element) would like nothing more than to see Law Enforcement completely abolished so that they can commit crimes with impunity and they take advantage of all the bleeding hearts as well as the folks with persecution complexes by spinning any lawful use of force as unjust, excessive, unnecessary, brutal, and motivated by discrimination where applicable.

In the end, people see/hear things however they want to, in whatever way supports their opinions and their lifestyle, so obviously dishonest people will choose to view police shootings in the most negative light possible because if they were to accept that sometimes police are in fact just keeping the peace and have to use force to do so, then they might also have to accept that some of the things they themselves have done are in fact wrong and have come at the expense of innocent people, ergo that Drunken Disorderly Conduct, D.U.I., or Domestic Disturbance charge they received was in fact justified. From there they'd have to face all sorts of difficult and potentially terrifying possibilities like their actions have consequences which would mean having to assume personal responsibility for said actions as opposed to simply writing them off, passing the buck, or making flimsy justifications like "Well, I've had it rough so It's okay to be a scumbag" for themselves.

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Shooting Comfort is bilateral.