Sira Moonwarden makes a lot of commentary about abandonment. About how the Kaldorei were betrayed by Elune because she allowed Teldrassil to happen, and she embraces undeath as a result because her Goddess did nothing to save her, or her people from burning to death, and just watched it happen.
Not to draw real life controversy or upsetting events, but during heavy times of war, or tragedy, sometimes we see people with faith begin waning. The idea that their chosen deity let this terrible event, or these people attack and kill innocents, is enough justification to turn their back because in the hour of most need, they received nothing. It’s a powerful emotion, really.