[ReddyRedWolf]

Originally Posted by Diveman

Spoiler:

But what I don't get is, why are the "titans" attacking AND eating people, since they don't really need to eat apparently.

Maybe people who are eaten by titans don't really get killed and after the titans return to their "home" they are alive and well and become titans as well. So I guess you could consider what the Titans are doing as "trying to make people realize they're all the same" by attacking. I remember Reiner said he has a "mission" to do and he will do it until the very end, maybe that's what he is talking about, to destroy the "walls" that keep titans and humans appart.

Umm... Titan regurgitate the corpses of the people they eat. This was shown in the manga.

Eren's father was a doctor. He injected Eren with something that made him a Titan. In one case a scout's mother became a Titan.

My guess some of the population inside the walls has been injected with Titan serum under the cover of vaccination.

Why Eren's father would do this we don't know yet. But the answer lies under his house's basement.