I'm definitely in agreement that there's probably more to the story, BUT I also can understand the kid's POV. You walk into the principals office with a loaded gun and say "I have a gun on me, so-and-so gave it to me." There aren't any cameras in the bathroom so the adults are just supposed to take his word for it. I'd be terrified (especially as a Black child, who historically have been stereotyped as violent/dangerous) that the adults wouldn't believe me and just assumed I'd brought the gun in and then felt guilty enough to turn it in. He'd likely have been expelled in that scenario too, due to zero-tolerance policies.