>>You know the context better than we do, and, of course, you have the final say.<<
I don't. For the purposes of this translation, I know as much as you do, i.e. the extract given by the person who posted the question.
>> If you want to know how "through incompetence" is used, you can Google it. <<
I did, of course, Google it and found nothing that explains it well hence my question.
>>Someone can be fired for incompetence, but bad things usually happen through or because of incompetence.<<
This explanation sounds good, but where to find info/examples that support this? But, if you are an English native speaker, I will take your word for it though.