You can have an opinion long enough you lose grip of the fact that's all it is. The same principle can be applied to beliefs and morals, And that realization can be terrifying.
My ex had an abortion while we were together, to a child come to find never existed at all. Yet that experience still weighs one me, and it is scary that I'll never know:
Whether the guilt I felt is one I hide within a changed opinion, or if my opinion is changed in order to find a justification?