Because the typical values of larger society are seen as corrupt by the cult, the values of good and evil within the cult change. This is brainwashing, and you seem to be too dumb to understand that. These cults have this fundimental set of rules.
1) Bad things are the influence of Satan or divine punishment for your sins
2) God wants women to be completely obedient to men.
3) Women should be modest and avoid provoking the lust of men
4) Men cheating is the fault of the woman as they were not sexually appealing enough.
This leads to cognitive fuckery. So while you and I see a man cheating on his wife as a failure of the man, cults like this see it as “Satan told that man to cheat, and he listened, but his wife didn’t do enough to stop him from giving into Satan and cheating so she’s more responsible.”
This sort of thinking also firmly places a big chunk of the responsibility on the victim - the wife. The wife who did nothing wrong. Who now gets punished for not being obedient enough.
In other words, while the man did a bad thing, he did it because an evil entity made him do it, he didn’t want to do it at all!
This breeds abuse like crazy, because the locus of control for responsibility is completely chucked out the window. While controlling everything the men can claim they have no control, while the women without any control believe they’re responsible. So to these fundies, while Josh did something horrible and wrong, the blame resides less on him and more on his wife and in the victims of his abuse. And thus they should forgive him because he wasn’t acting on his own control - Satan made him do it.
As a victim, it’s also an implication that God wanted you to suffer like this. Remember also that you’ve been taught that God is never ever wrong. So you must, must have done something wrong to be the victim. And the community of fundies often stresses that you’re responsible. Where’s the pamphlet these crazies use to try and explain why god is fine with sexual assault? Someone link that again, because obviously people haven’t read it in this thread yet who really need to.