Why was the land full of blood?
Radak: (This is the text in the accurate texts, which are the minority 1 .) It was full of murderers.
Radak: Most texts say that the land (Eretz Yisrael and Yehudah) was full of Chamas. Therefore, the land was desolate from them. Even though they had other Aveiros, the biggest was theft, for society cannot endure with it. The flood came due to theft!
What is "Muteh"?
Rashi: It is perverted judgment. Radak - it used to be full of [proper] Mishpat. All of Yisrael used to come to Yerushalayim for Mishpat.
Why does it say "Ki Amru..."?
Radak, Malbim: Their evil Emunah (that Hashem abandoned the land, and does not see) caused all of this.
