Im finally finished w my dozen assignments and am ready to tackle this *cracks knuckles*
Firstly, the notion that wei wuxian didnt have fun in the jiang clan because of madam yu is incorrect because we do have scenes of the kite flying, the watermelon thing, and its reasonable to assume that there were more simply due to wei wuxians joyous aura. Also, jiang cheng and nie huaisang, despite drinking didnt face punishment because 1. They didnt sneak liquor in 2. They didnt rub it in lan zhans face and 3. They didnt piss of lan qiren during class. Not to say that lan clan wasnt at fault here due to inconsistent punishments, but to think jiang cheng shouldve faced as much punishment as wei wuxian is also incorrect because 1. Jiang cheng was remorseful most of the time whenever he was caught and he even apologized for wei wuxian 2. I think lan zhan made it his personal mission to punish wei wuxian and jiang cheng had nothing to do with that.
Jiang cheng did have anger issues, but wei wuxian also was very irresponsible and i like to fuck around kinda guy. Theres even this famous meme that says wei wuxian is fuck around and jiang cheng is find out.
I think partly your point does make sense because jiang cheng shouldve helped wei wuxian, but you have to understand wei wuxians actions couldnt be the reason for the jiang clan to be decimated again. Moreover, if wei wuxian wanted to help the wens so much, he couldve relocated them to far off villages (like the one xiao xingchen was in. It was so far off from the cultivation world that for years they were the only cultivators present) this is the part that pisses me off a lot, not at wei wuxian but at mxtx because we know the wens dont have any defining features because sizhui remained undetected for years. The only plausible reason i think wei wuxian chose to keep all of them on that mountain is because he wanted a purpose for himself because in his eyes, without a golden core he was useless.
On the notion of jiang cheng helping wei wuxian despite the consequences, you have to understand that the jin clan was known as the most wealthy or powerful (i dont quite remember) and if jiang cheng stood with the person who humiliated jin guangshan, the jins wouldnt have ever helped rebuild the jiang clan. Moreover, in jiang chengs eyes, lan zhan didnt like wei wuxian because of his use of demonic cultivation, as we see from the scene where jiang cheng and lan zhan meet wei wuxian again and lan zhan is immediately hostile and jiang cheng is happy. So, if jiang cheng stands with the person whose actions a very prominent figure of the lan clan doesnt approve of, it could mean the lan clan wouldnt help the jiangs either.
You have to understand, if jiang cheng stood by wei wuxian, both the wens and the jiangs would have been decimated. The only reason jiangs survived this long and jin ling even exists is because jiang cheng chose not to. Was he happy that wei wuxian is finally an outcast, we dont have a proof that that is true. But to know that jiang cheng never bought any dogs again and kept wei wuxians flute for years, proves to us he was either remorseful or missing his brother.
Im glad we agree on one point. Many people think wei wuxian was completely blameless here.
Im sure you dont recall the case im talking about since i was very broad. Im gonna explain the scene a little and add in the dialogues.
So it's from the first book where everyone is at the cloud recesses and wei wuxian punches jin zixuan. Jiang fengmian then comes around i think the next day? And while jiang fengmian is talking to lan qiren i assume jiang cheng and wei wuxian were talking. Jiang cheng says oh i wouldve stepped in soon after you and wei wuxian says no you shouldnt have. Actually, if you did step in it wouldve been better because jiang fengman wouldnt have shown up.
This is the scene (i got it online from fliphtml5)
Im talking about subtlety here. Just the way wei wuxian was unable to recognize that jiang fengmans absence in his son's life is bothering, similarly, jiang cheng failed to notice his brother (who assured him everything was fine btw) was descending into madness.
Im not saying jiang cheng is completely blameless, but to think that jiang cheng is a terrible person who deserves to be alone and wei wuxian is a saint is also wrong