As a trauma survivor I can tell you there are no answers, and that Emunah means being able to have faith despite not having any explanations/answers. There are answers, but they don’t really address the question fully and satisfactorily.
I don't think you understood what I wrote. My point was that in many (most?) cases, the sfeikus in Emunah are not caused by the trauma. The theological questions are there, with or without trauma, and those questions are very often legitimate. The trauma causes people to either a) not be receptive to the answers, b) not be receptive to the people/seforim giving the answers, and/or c) look for answers in other places. So, in that sense, trauma is the cause for most OTD people leaving, but that doesn't mean that the theological questions they have are rooted in their response to the trauma. There are some people who's questions are like you say, i.e.
where was G-d in my suffering, how could G-d allow it to happen, why do bad things happen to good people, if religion is supposed to bring out the best in people and have them follow in G-d’s ways, why are some so-called religious people (even popular Rabbis) evil? and other similar questions.
but IME, that's not the case for a large number of the people who go OTD. By reducing the path they've decided to take as simply a reaction to their trauma, you inadvertently cause them to conclude that there are no answers to their theological questions, and that Orthodox Judaism must not be right way. Both things need to be acknowledged and addressed. "I'm sorry that this was your experience. It was wrong for XYZ. Your trauma is real/understandable, and it must be addressed properly whether you choose Orthodox Judaism as your path in life or not. Your theological questions about life and Judaism are also legitimate. This is what we believe and why."