https://factsandfaith.com/the-witnesses-who-and-how-many-people-saw-jesus-alive-after-his-crucifixion/
Link plus clarification.
Think God was even harder on those He chose and later fell into disobedience than those that started off worshiping foreign gods, yet in some extreme cases would rather have those souls destroyed than spoil the whole barrel to avert having to bring the end of the world. Tough divine love and justice for the greater plan and good, is perhaps a better way to look at those perceived genocides.