Textual: This verse is Mormon’s interim conclusion and moral of this section of his chapter. Mormon wants us to understand that while the Lamanites might be undesireable, the apostate Nephites were worse. Certainly the story of Amalickiah demonstrates that he was a wicked man when judged against Christian morality, but he was an individual. Mormon nevertheless uses him as an example from which he generalizes to all apostates.
There is no chapter break here in the 1830 edition.