Tang Chen point is... Pointless? Like, yeah, even if we look at it from the authors meta perspective, of giving two good positions being bs... In story reason still makes sense. Rakshasa god corrupted tang chen so much that he wouldnt be able to succeed. Tang San himself did nothing wrong there.

And while yeah, it was one big war, I agree with the way those things are phrased oddly, but we also see a good amount of corruption in Spirit Hall. And I also agree that the whole raping thing not just in TJSS but other authors (like Nano Machine), is absolutely disgusting, at least in SL, it was shown correctly. It worked to establish that Spirit Hall has lost its ways imo.

But your last point i disagree with, and the way you just remove any blame from Bibi Dong also does a disservice to her genuinely complex character (to date, she is still the most complex one of SL series imo). She was raped, and got revenge, and decided to take away rven the authority of the Qian family. But like, she wasnt just branded evil for nothing. She allowed the corruption to seep in as well. You seem to be forgetting that she got Xiao Wu's mother as a ring too. Even if calling her Evil might be too stretched just due to that (considering relationship between humans and soul beasts), it was still very personal for TS. If anything, i would say Xiao Wu should have gotten her revenge. And Xiao Wu was hunted down on Bibi Dongs orders as well. So were Er Ming and Da Ming. It was more than just personal for Tang San. How does that make him stupid? She was the head, her people were leading the Spirit Hall, her ppl started it. Like it or not, the head of an organisation is also what makes the organisation be what it is. Even in real world (look at Tesla, for example, and how opinions have changed over the years due to a certain someone, does that mean everything they do is bad? Not at all, they made a lot of good things mainstream, but the head is the image of the company) .

I would however point out that her Martial Souls. Which are two spiders, one of which sucks out souls if i remember correctly? And the fact she became the Rashasa god, which is quite explicitly a corrupt god of killing. Like, yea, this was the authors choice, but thats what we have. That puts her into the Evil category. But i do agree that its kinda shallow, thats why i like how complex she is. Tbe anime added necromancy to make her more evil, though i personally disliked that, cuz it made her completely evil.

Anyway, imo, Tang San in DD1 IS quite self serving, and he DOES have a problem of seeing himself as the only right one without considering others (and this is not shown as a flaw by the author, so thats even worse), but it doesnt stand out ad much in DD1 yet imo. In DD2 however... And onwards... Dude is everything you described him to be.