Can someone explain mood of sentence begining with " Can I say of..."

Solution 1:

It is a rhetorical question that needs no answer. All your examples fit the pattern of:

Can I admit A to be true, when all my feelings point to its not being true?

This means that despite A being factually true, I feel and wish the opposite to be true.

Can I say she is dead, when my memories of her are so vivid?