User blog comment:MeDeoPal/On the Origin of Titans and Shifters/@comment-155.158.60.209-20131118075732/@comment-155.158.60.209-20131118081507

Answering two upcoming questions.

1. The project was invented, issued and carried out by extremist group.

2. The "brainless" titans are like machines following the primary objective of the project.

The biting and eating were originally meant to infect, why it does do so anymore, I don't know. I can only guess that it remained as a sort of habit.