I got your point, IMHO the army recruitment can improve their caste in society, true that from time to time the quantity would be declining as the lost wall maria, but that enough for them to get assurance from the castle when their caste rose.
From what I catch the castle don't give a damn about the the human survival . . ., true now the titan have more power than the human, but I have the feeling the titan would be overwhelmed when they want to broke the center castle.
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