“Should” in order to achieve a certain end? To meet some criterion? To boost a term in your utility function?
In the OP: “Should” in order to have more accurate beliefs/expectations. E.g., I should anticipate (with high probability) that the Sun will rise tomorrow in my part of the world, rather than it remaining night.
Suppose someone draws a “personal identity” line to exclude this future sunrise-witnessing person. Then if you claim that, by not anticipating, they are degrading the accuracy of the sunrise-witness’s beliefs, they might reply that you are begging the question.
In the OP: “Should” in order to have more accurate beliefs/expectations. E.g., I should anticipate (with high probability) that the Sun will rise tomorrow in my part of the world, rather than it remaining night.
Suppose someone draws a “personal identity” line to exclude this future sunrise-witnessing person. Then if you claim that, by not anticipating, they are degrading the accuracy of the sunrise-witness’s beliefs, they might reply that you are begging the question.