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Do you think that Michelson-Morley were comformed with the failure of their experiment and were happy with Einstein's explanation and then dedicated to the garden of their houses ?  Of course not ! They continued their work, revised their failled experiment, created new experiments and in 1926 they had success and were able to measure the absolute speed of Earth. Everybody knows about their failed experiment, but nobody knows about their successful experiment.

Michelson-Morley were not only the ones, other scientists created other experiments and among them was a guy named Georges Sagnac that in 1913 had also success in measuring the absolute speed of Earth.

As the successful experiments shows that the speed of light is not the same in any direction and this contradicts Einstein's basic postulate on which all his theory was built. In consequence the successful experiments were burried, ignored and send to dusty cold files where almost nobody knew that ever existed.

These experiments remained forgoten and nobody knew about their existence until the 70's. Sagnac experiment was resurrected by other reasons nothing to do with Relativity. Replacing the light sources of the Sagnac experiment by lasers it was posible to create a small, very cheap solid state without moving parts device that was able to measure the absolute speed of something with excellent precission. Something very useful for planes and missiles. It contradicst Eintein's theory ?, who cares, it works, is useful and so, everybody use it today.

Really? Are you aware that the Sagnac effect was predicted using special relativity in 1911, by Max von Laue? Absolute speed needs an absolute frame of reference, are you proposing returning to the 19th century theory of ether? By the way, how do you know those measures were the "absolute speed" of Earth? Where did you got that notion?

By the way, the 70's experiment that your refers seem to be the one performed by notorious crackpot Stefan Marinov. Have somebody else, using a similar machine, obtained the same results?