User blog comment:Raul123alin/My theory about the origin of the titans/@comment-31.151.171.96-20151010002627

WARNING SPOILERS

Think about this:

- Notice the clothes of Berthold/reiner and the ape titan guy wear. Notice the clothes of grisha when he first entered the wall. These clothes look from a different time period if you think about it. Especially the military boots on Reiner and the ape titan in the last few episodes.

- Remember the canned food and the weird labels in the castle utgard saga.

- Notice the science vs religion (and politics in general) theme throughout the series.

Could it be that before the titans appeared, a war raged between science/progressive people and religious nuts and the titans were used to win the war by the science/progressive people. The religious people either stole the tech and surrounded themselves by the walls, or were 'banished' to living inside the walls by the victorious science/progressive people.

Now, 100 years later, the progressive people have advanced (their society advanced maybe to the 70s maybe 80s, im talking about cars and shit). The war has become a 'cold war' the titans keep the religious people inside the walls, and the walls keep the titans outside. For whatever reason, berthold and reiner and the ape titan start a campaign against the 'religious nuts' to finish the conflict once and for all.

In conclusion: maybe 'the other side' or the 'home village' mentioned by reiner and bertold is a city/country/perhaps a whole world of a progressed non-religous society (having 70s+ technology).