κακά and σωτήρια are predicates: cp. Eur. Hipp. 471 “ἀλλ᾽ εἰ τὰ πλείω χρηστὰ τῶν κακῶν ἔχεις”. Cp.
. Oed. means: "By pleading with me to return, you will only illustrate your own heartlessness: you will never win me as a safeguard for Thebes."“ἐκ τῶν γὰρ αἰσχρῶν λημμάτων τοὺς πλείονας
ἀτωμένους ἴδοις ἂν ἢ σεσωσμένους
”