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”.
Why is it a sin to deny a lot of evidence, but not a little evidence?
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.