You see, a Bodhisattva is an Enlightened Being who, out of great compassion for all, decides to forgo Final Enlightenment by turning back from it just before reaching it, in order to return to Samsara (the realm of suffering, where we are) to save all suffering sentient beings.
I figured it must be a tough balancing act. On one hand, the Bodhisattva must have developed enough good karma to reach Enlightenment, but on the other hand, he must carry some bad karma so he can turn back.
Hence, I realize, it is important for a Bodhisattva to commit Just Enough Bad Karma.
Which is why, instead of driving a Prius, I drive a large Lexus SUV.