Earlier quoted context omitted.
I don't know if this is true. I've had a couple of friends go through manic episodes, and while I very much did not enjoy it, there's a world of difference between them in normal-mode, and manic-mode, and I don't think I trust them less as a result. Maybe it would be different if violence was involved - but I don't think that's very common.
The critical thing is that you're aware that your friend in normal-mode will do different things than your friend in manic-mode. The default assumption is that people have various levels of predictability and trustworthiness in normal mode; learning that someone made a terrible choice once means that their morality and wisdom is not what you thought it was, or at least the variance is extremely high. People with bipo…
In general, I think trust is the wrong rubric for living with humans. It's better to have faith. In reality, people make horrible decisions and do monstrous things all the time, especially neurotypical people, and if you can only trust people who will not make terrible choices, you should trust no-one. History proves that the vast majority of people, in the right circumstances, will do astonishing and awful things.
It makes more sense to treat it as a moral good in and of itself to trust other people, no matter if they let you down or not. That's the key insight of having faith in the people around you. Maybe they will let you down, maybe they won't, but suffering for an overabundance of faith is a worthwhile kind of suffering.