I love the concerned responses to this kind of stuff. One, no one has any context for what is happening here. Is it his go kart? Did a teammate bring it in? Is it one they have at the facility specifically for the players to goof off with a little bit?
Second, the idea that if the team isn't doing well these guys aren't allowed to do anything that might be perceived as light hearted or fun because it is evidence they don't care and aren't taking their job seriously. There is a 10 second clip of him driving a go-kart around so clearly all he did all day is screw off. Never mind the fact that Breece probably works harder at his profession than 99% of the people who criticize him.
And the hell of rehab he went through.