Responses
Seth and Isis can't judge each other because they are almost the same emotionally wise. They're the only ones with true sibling-likeness in the group, as they're both kinda identical in their unfair, selfish reactions.
Isis is sometimes like a female Seth just with longer hair and breasts, in many respects, if you ask me. So them going against each other is senseless and only serves to give Osiris more opportunities to scr** more with the both them.

Chapter 45 spoiler
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This lady really wants to destroy all of Egypt if Horus doesn't win! She wants to get back at ALL THE GODS who turned their back on her in Seth's rain. She now cannot judge Seth for what he has done to people during his rain for she is planning TO WIPE OUT THE WHOLE COUNTRY WITH THE NILE