There are inumerable vectors of inertial forces and gravity everywhere. On an elevator cabin in free fall, why they are making a big fuss ?

In a moving passenger car, MM experiment is being done. Between two light pathes diverged by a half mirror, there is considerable difference in length. Lorentz contraction will not stand up.

Plain waves of light (wavelength is constant) are coming from the upper right 45 degrees. Two bars of the same length are moving to the right and the left at the same speed. The number of waves hitting the bars is the same. Lorentz contraction is unthinkable.

In a passenger car, a light source is placed on the floor. Two light rays (frequency is constant) are being sent to the two mirrors on the roof and return (only once : light paths form letter V). Number of waves existing on the light paths is invariant. This passenger car is moving.

How the above is visible to an observer on the ground ? This picture will be incompatible with constancy of light speed, Lorentz contraction and relativity of simultaneity.

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