You're one of those guys, huh? Machado is a competitor and an entertainer. He's out there because of his talent and drive and desire to compete, but his job is to entertain. He wants to hit 4 or 5 bombs in a game. His fans want to see him do it.
If the manager wants to sit players then pull Jones or Davis or someone not chasing a major league record or at least a personal record. If Machado pulls a hammy stretching out a double in the 8th, oh fucking well. Shit happens. You don't pull your stars every time you feel you have a comfortable lead.
None of this should be news to you. You watch baseball. Come on.