Rav Avdimi bar Chama bar Chasa explains that humans must willingly accept the Torah, and if not, they will be sentenced to the death threat in which they will die if they go against this claim, which justifies the extrinsic incentive. However, Rav Acha implies that instead, it will eventually force the people to lose their belief in the Torah, ultimately separating from God. This emphasizes that the role of God is to present us with the Torah, and the role of the people is to accept the Torah "well and good," and if not, they understand that will be die.
