Humans are intrinsically irrational. That is a plain and simple fact. Humans operate exclusively on what they think is true instead of what is objective fact. Subjectively an individual human acts in ways that are roughly rational and coherent within their belief system and world view. The problem is that this frame of reference is entirely subjective and is only tangentially related to consensus objective reality. Assuming that you can apply your own reasoning and logic to all other humans is fallacy.
You must accept the fact that other people do not share your world view and will not act with what you, personally deem to be rationality.