system
Given the following post, respond as if you're commenting on Reddit:
human
[Attack on Titan] Why are there so few internal fortifications between the walls?

I can understand the civilians who've been behind the wall thinking that the walls can't be broken through (and for the most part, they can't), but what about the people who built the wall in the first place, or the military when they realised that Wall Maria had just fallen and they'd lost 30% of all their land?

Why are there massive gaps between the walls when you could have bunkers, towers, castles, gun emplacements, traps etc. all the way between them to slow down any titans that might pass through?

Why have these great big amounts of countryside when you have years and years available to you to sculpt the terrain to adapt to the 3D Manoeuvre Gear and make your troops as effective as possible against the lumbering titans?
gpt
<SPOILERS>

Well first of all the walls weren't built by humans, they're made from Titan shells. Secondly, the people in power weren't concerned with saving humanity when the walled cities were founded. Their goal was to create an insular community where the people lived according to their wills and beliefs. Creating the optimal situation to protect humanity from the Titans has NEVER been the motivation of the ruling class. All they cared about was keeping the lower classes scared, weak, and obedient. In fact they deliberately suppressed any advanced technology that might've allowed the common people to usurp their power. For as yet unexplained reasons, the royal family wanted to keep humanity subjugated. That's why people never did X logical thing to fight the Titans. Because humanity is being deliberately held back.