stand your ground does not give you the right to shoot someone who is breaking into your car, unless they're doing so while you're sitting inside it and meaning to cause you harm at the same time.
Missouri has stand your ground laws that do not require a person to retreat if they feel threatened. Therefore if the perp breaks into his car, the owner of the car confronts the perp and then feels threatened, then he may engage the target. You don't have to be in the car, you just have to feel threatened by the perps actions.
Example: He turns with a crowbar in his hands after breaking the car window and moves rapidly towards you, or he turns and faces you with his hand concealed, or he turns and moves toward your spouse with crowbar, etc. etc.
No technically you can't shoot him for breaking into your car, you have to "feel" threatened. So before you shoot, while your spouse films it, repeat loudly three times, I feel threatened, I feel threatened, I feel threatened, then you can engage the perp within the terms of Stand your ground.
Stand-your-ground law - Wikipedia establishes a right by which a person may defend one's self or others (
right of self-defense) against threats or
perceived threats, even to the point of applying
lethal force, regardless of whether safely retreating from the situation might have been possible. Such a law typically states that an individual has no
duty to retreat from any place where they have a lawful right to be
[1] (though this varies from state to state) and that they may use any level of force if they reasonably believe the threat rises to the level of being an imminent and immediate threat of serious bodily harm and/or death.