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Reading the quotes from Ashe reminds me of some of the cops who plant evidence at crime scenes: they’re convinced they’ve already got the right suspect, and manufacturing evidence is just a convenient shortcut for persuading everyone else of their version of the truth.
It always seemed like a natural assumption to me: the particles we know about were discovered because they interact with each other via at least one other force in addition to gravity. But there’s no other force common to all particles, so why not expect particles that only interact via gravity? They’d naturally be hard to detect, since gravity is so much weaker than the other forces.
Assuming that the only particles that exist are the ones that happen to be easy for us to detect feels like observer bias.