It's more like, my equations that work for everything else don't match what we observe in a few cases. But if there's something sitting on the seesaw that I ca

It's more like, my equations that work for everything else don't match what we observe in a few cases. But if there's something sitting on the seesaw that I can't see then it works everywhere. And there being a particle (or particles) that doesn't interact with the EM force is a testable theory. We've used particle accelerators to continually exclude areas of energy that the particles themselves would exist in, and eventually we're going to detect everything that we've predicted with the standard model or we'll find something new in an area that we didn't predict and start to know where things are actually wrong. Either in the particle side of things, or possibly the gravitational side of things. We know there's something missing or wrong between the two of them but they appear to work correctly for every case that we've found a way to test for so far, even if they don't seem to be possible to merge together.