If you start to write an angry email, pause, and genuinely think of valid logical arguments (knowing that the previous anger may still be biasing the reasoning)

If you start to write an angry email, pause, and genuinely think of valid logical arguments (knowing that the previous anger may still be biasing the reasoning), that isn't deceptive. If you're masking the anger and not trying to reason calmly, which implies that you're using motivated reasoning, that is deceptive. Similarly with an (AI) speech editor, it depends on whether you're just trying to score points easily or whether you have the genuine intention to connect your experiences to your audiences' and give a thought out speech. Unfortunately, the results might be similar, but we should all aim to encourage the latter and discourage the former where we can.