If you think about it, using “polite” language increases the probability the LLM will return a genuine, honest response instead of something negatively tinged or hallucinatory. It will mirror the character of language you use
this is what I was going to say. in fact it's the same principle in real life, if you are polite with people they will be polite back. The LLM has just learned statistically that blocks of text with polite language generally continues.