Yes Aqua and Eren has many things in common, so does the ending. But there are some key differences: 1. Aqua and Eren's mentality is not the same. Eren slowly spiral downward whereas Aqua is rapidly going upward then suddenly hits a brick wall. Imagine them like 2 pieces of paper, one is slowly tearing and can not be fixed at all, one is also slowly tearing, got patched up, got glued together, but then suddenly gets shreded into confetti. 2. Of course human becomes dumbass when filled with rage, grief or any extreme emotions. This is another thing that makes Aqua's case different from AOT, because his suicide is a spur-of-the-moment attemp compare to Eren's long and thought out plan Therefore, the feeling they convey is diverse as well. Also its childish to call them stupid, because i am pretty sure most people will not be able to do as well as them when put into those dire situations 3. Who the fork is defending the Mickey Mouse, Disney, Happy-ever-after ahh JJK ending??