I should point out that pellet guns do not have a ‘Day-Glo Safety Orange/Red’ tip.
As they do eject actually harmful projectiles; they look much like other guns until you get close to them. Reasonable parenting would have included making sure the child understood that under no circumstances do you point that at people.
That doesn’t make this less of a tragedy, but it does provide some context to the situation. Cops are, sadly, trained out of necessity not to try to discern when on the receiving end of any gun barrel. While it’s difficult to expect a child to know not to point weapons at police; doing so is in fact dangerous.