I initially thought the same as ole' George, but in this case the load on the bolts is shear force. The lever being above and being pulled actually forces the U bracket against the diff. If you were just hanging a load off the U bracket (without the lever) then definitely it would be up side down.
Basically the deadweight of whatever you lift will put that amount of shear force on the bolts. The tensile pull on the lever and link will be much greater.
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