One: Protons and neutrons aren’t oppositely charged.
Two: You’re using particle physics as an example of an area where experiment is the final arbiter; you might not want to do that. Scientific consensus has more than a few established beliefs in that field that are untested and border on untestable.
Fair enough; I had wanted to say that but don’t have sufficiently intimate awareness of every academic field to be comfortable doing so. I think it works just as well to illustrate that we oughtn’t confuse passing flaws in a field with fundamental ones, or the qualities of a /discipline/ with the qualities of seeking truth in a particular domain.