Because the less evidence there is, the better the chance that we’re mistaken about it, all else equal. But this seems obvious enough that I guess I’m missing your point.
Sure, the weaker the evidence, the less you’ll be misled on average by ignoring it. But there doesn’t come a point where ignoring evidence is not misleading at all compared to updating on it. It’s never going to be a good idea to start saying to yourself “that’s only a little bit of evidence, so I’ll just pretend it wasn’t there”.
Because the less evidence there is, the better the chance that we’re mistaken about it, all else equal. But this seems obvious enough that I guess I’m missing your point.
Sure, the weaker the evidence, the less you’ll be misled on average by ignoring it. But there doesn’t come a point where ignoring evidence is not misleading at all compared to updating on it. It’s never going to be a good idea to start saying to yourself “that’s only a little bit of evidence, so I’ll just pretend it wasn’t there”.
If updating were costless, I’d agree.