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Nobody is saying we should penalize people for making accusations. Being asked to substantiate your claims is not a penalty. It should be understood that people will ask that when you make a public claim, especially if you are asking for something to happen as a result of that claim.

I'm not sure what we gain by encouraging people to make unprovable accusations. From the outside perspective, people will be predisposed to believe one way or another, and in the absence of any evidence they'll just go to their predispositions and a lot of irrelevant argument will take place back and forth with no possible resolution, because there is no real evidence. Why is this helpful or desirable?