Where do you aim your mirror?

[caprice]

I have noticed many people aim thier side mirrors to look behind them. I don't know why. Thats that the center rearview mirror is for. I have always used my side mirrors for sideways/ behind, and Ideally it would eliminate the blind spot. Why don't they go in side the car near the A pillar?? they would be right there easy to adjust, and stay clean, and best of all be more areodynamic. There is a way to remove it but still have side morrors.