I think something no one could possibly understand is just how hard the life of a shliach is in the middle of nowhere.
If they started to waver in their standards they'd get the heck off shlichus before anything else.
The life of a shliach in the middle of no where especially, is insane. Literally incomprehensible to anyone else.
The only way they are staying on shlichus is if they are beyond careful in halacha and the Rebbe's horaos.
That said everyone is human and I'm of course not saying that these people are beyond reproach or anything, but when you have seen it and experienced what they go through, you get an appreciation for who these people are on a human level, and you can't get that with conjecture.