Secondly, Strong’s disagrees with you over your dismissal of harpagmos meaning "a clutching to oneself of something to retain it.
ἁρπαγμός, -οῦ, ὁ, (ἁρπάζω);
1. the act of seizing, robbery, (so Plutarch, de lib. educ. c. 15 (others 14, 37), vol. 2:12 a., the only instance of its use noted in...