Eminem was just trying to draw attention to his dead career.
But on the actors (who make a living being someone else as they play their parts) musicians and athletes getting political,methyl should I care about your opinion?
As Frank Zappa said - shut up and play your guitar. Clear and to the point.
Unless you're Taylor Swift and then it's, "Put down your guitar and say something bad about Trump or else you're a Nazi enabler!"