I don't think Polestar should be banned, nor any other Chinese car maker for that matter, but I can understand why Volvo gets a different treatment.
Volvo probably employs several 1000s of people throughout the US from decades of dealerships, workshops, second hand sales etc, and they have a relatively large factory in the US.
Polestar OTOH has no factories and use direct-sales instead of going through dealerships.
So it's likely that Volvo generates a lot more value inside the US than they extract, while Polestar probably doesn't.
Volvo probably employs several 1000s of people throughout the US from decades of dealerships, workshops, second hand sales etc, and they have a relatively large factory in the US.
Polestar OTOH has no factories and use direct-sales instead of going through dealerships.
So it's likely that Volvo generates a lot more value inside the US than they extract, while Polestar probably doesn't.