@KatyElphinstone sure. But a great way to trick people into thinking it's not black and white (which isn't a bad thing) is to tell them even when most unreasonable that their point is valid from their perspective.
Because it actually is. Their opinions and theories may seem incoherent and nonsensical from one's own perspective, but since their brains have produced those results they must make sense to them.
Humility helps also. To every theory there are theoretically infinite alternative theories that may also be true. So thinking one's own perspective is the only one valid is not very smart. Instead adopting a "I think it's like this or that" while also maintaining that that can never be the last truth (since it cannot) is a very good way to make people actually listen without alienating them.
It's just like there are no lies, just misunderstandings. If someone seems to not tell the truth, we just don't understand what they're saying. It's like a code that needs to be deciphered in order to understand what they actually mean, even if it seems that they are deliberately deceiving: They do it for a reason. Find out that reason and one can tell what's actually behind those words.
Psychological analysis is a great way to get to know people.