In those situations, it's appropriate to point out potential biases or agenda from the author, but it is not appropriate to reinterpret their words based on a m

In those situations, it's appropriate to point out potential biases or agenda from the author, but it is not appropriate to reinterpret their words based on a mental model one has of the author. That model is likely to be flawed and incomplete, but even worse, it makes the text subjective. Two people, reading the same text, won't agree what it said. That prevents honest discussion.