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Galaxies spinning too fast according to the laws of gravity, galaxies, too hot, galaxies acting by other rules. Galaxies not obeying the rules of cause and effect?

If a theory violates locality and/or causality, it is unlikely to fit in with our theories of physics, which do protect both principles

"If one gives up the principles of causality and locality, then it means we are essentially unable to explain the structure of the Standard Model of Particle Physics and General Relativity, as they are some of the central principles that go into constructing these theories in the first place," Hertzberg said. "In other words, if causality were badly broken in nature, we likely would have seen it already in various corrections to particle physics in the lab or tests of gravity in space."

In other words, we should've noticed by now.

Since all available evidence indicates that locality and causality are preserved (at least at macroscopic scales), then they should be obeyed by any new theory of physics. The team of physicists put MONDian theories to the test and found that they contain features that allow for non-locality and acausality. In other words, if MONDian theories are correct, then it's possible for events to happen without a cause and for effects to travel instantaneously, which violates the speed-of-light limit in the universe.

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