In Beckett's Waiting for Godot, Pozzo tortures Lucky to have a feeling of (false) strength. In Endgame, Nell hates Hamm, his son, because she had dreamed of eternal romance and was deeply disappointed by marriage
Clov both loves and hates Hamm who never minded him when Clov needed a father
Hamm, too, has been very unkind with Clov and Pegg because of his egoism
In Endgame, Evil is a result of stupidity and selfishness.