tl;dr (wait, I'm already contradicting my end sentence...) : I agree with the actual moderation but believe that credits pages are an abused loophole that are not handled the same way every social interaction are (that should be kept civil), and hence should be moderated the same way comments and forums posts are (in regards to being respectful).
I voted "No, I believe that the rules are fine as written and that current moderation efforts are satisfactory. " BUT, there's a BUT.
I agree that you shoudn't allow direct/personal attacks towards groups or otherwise similar offensive behavior in credits pages.
I don't see why this wouldn't be allowed on the forums/comments but allowed in the credits pages really, it has much more of an impact than in comments/forums.
While I don't care that much about sniping etc, which some will consider disrespectful (both sides have respectable arguments, I won't delve into this in this case), directly attacking a group in credits pages is definitely disrespectful and harmful towards a good and healthy relationship in general.
Loopholes should be addressed by moderators according to what is weighted as severe enough to take action. While in almost every case this had been handled very well so far, I do firmly believe that the issue about credits pages has been handled quite poorly (and I'm not talking about only recent events but even some way older, quite offensive and directly attacking a group, credits pages).
Not that the moderation has been lazy about it, just that for some reason, it hasn't been handled the same way everything else has been so far, in my modest opinion.
The insults/disrespect shown in credits pages has been so far, imo, been tolerated a lot more than in comments/forums. I understand you may find credits pages to be a bit different because they're part of the "content" and not of the direct interactions made through MangaDex features such as the comments and forums, but I believe they should be handled the same way.
I don't find this hurting in any way the freedom of speech any group may have, but personal feuds have always been and should always be private. Making them public in a group's own social media (Discord or whatever) is to the group's discretion, but trying to influence everyone that reads the chapter and purposely create drama out of it by using (in this case, MD) features from a support that's made to support them (and not to allow them to wage wars) is, in my opinion, a purposely abused loophole and should be handled as such (not definitely forbidden but definitely considered not civil and punished as such, aka removing the credits page or making sure it's modified to be civil, but nothing more as punishment, except, of course, if the offender keeps offending).
Wall of text, sorry, it's 01:30 AM and I've got a few beers down the throat, definitely not feeling like trying to munch this and make it shorter than it is, bear (beer) with me on this one !