#-evidence. but it's more likely to be reliable than trusting 'wwx killed 3000 cultivators at nightless city' when 'he killed 5000' is right

[withthewindinherfootsteps]

Clarification: the point of MDZS isn't to distrust every rumour you hear. Some of the rumours in the prologue turn out to be right! The Jiang clan did take Wei Wuxian off the streets! Wei Wuxian did destroy (half of) the Yin Hufu before he died (and did ‘destroy the weapon’ in the sense it couldn’t be used anymore, because it required two halves to work)! He was one of the most promising cultivators and found success at a young age! He did die!

The point is thinking critically about the information you receive. Don't believe something because it suits what you want to think of someone, or because everyone else is agreeing with it. Believe it because there's strong evidence for it. Lan Wangji puts it best:

Lan WangJi slowly shook his head, “One should not comment without understanding the whole picture.” - Chapter 30, EXR translation

With Wei WuXian expanding on the reasoning (same chapter):

Just like you, I don’t understand the whole picture, so I’m not going to comment either. You’re right. Before knowing all of the turns and twists, causes and effects, nobody should presume anything about anything.

(And for context, this attitude is proven right! The conversation is about whether Xiao Xingchen performed lingchi on (severely tortured) Chang Ping, and there end up being so many unexpected twists and turns in his story that any judgement made without evidence would have been impossible to get right*. Wei Wuxian only makes his guess – that Xue Yang did it to take revenge for Xiao Xingchen, in his twisted way – after he has the relevant information of the Yi City quartet's story. And, seeing the nerves he hit, it seems to be correct.)

In fact, that's something we ourselves have to do throughout the course of the novel – weighing up what we know of Wei Wuxian's past deeds with what we see of his personality and actions in the present day. Those who still blindly trust the rumours up until the Second Siege are shown how unwise that is by being proven wrong... but that's not because having any opinion that happens to agree with a rumour, no matter the amount of evidence, is automatically wrong. As I mentioned, some of the rumours are correct! It's because how Wei Wuxian acted in the present day – ie the concrete evidence we have – didn't match up.

Blindly distrusting rumours is exactly the same as blindly trusting them.

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*Without making a random, lucky guess. And since that would have no proof behind it, and a greater chance of being wrong... well, I think we can all afree that random unbased guesses aren't the way to solve mysteries.