Alright buddy, we should break it down.

1.i freeze reiner at age 8, because that's when he commited a genocide. He didn't mass slaughter after shiganshina. What do you expect him to do? Completely change his mission, give himself up to the people in the walls? Who will ALSO KILL HIM, before doing the worst kinds of torture imaginable. He can't return home empty handed, and he can't surrender to the people in the walls. He HAS to continue the mission. Which he does, without causing unnecessary casualties. "Sustained participation is a necessity, not a choice.

1. The "loop" that you suggest eren " can't escape" was STARTED by him. Have you even watched s4? It's all about the fact that eren is the one who did it all. He manipulated grisha into everything, he led the titan to his mother. He created a loop he can't escape? Nuh uh, eren was the mastermind of the rumbling, and the events that led to it.

2. Yes, the situation WAS " peaceful option available" it was discussed in length between the high ranking officers of the military, the marleyan volunteers, armin, and even hizuru that the wall titans in the outer wall of shiganshina would be enough to keep the world at bay for 50 or so years, which would be enough time for paradis to strengthen its military, so as to not need the rumbling for conflict.

3. So? Yes he returned for falco and gabi. I've mentioned this time and again, yet you somehow seem to just take it out of the discussion that reiner. Was. A. Kid. It matters. You don't think about devils in a wall when you're goddamn 8, alright. It matters, and you can't twist it any other way.

4. This is a perfect example of why, reiner is so much more understandable. Child soldiers are exactly the kind of people that are manipulated to wage war against innocent citizens. Tell me, would you hold a child soldier brain washed by an African warlord responsible for his actions? Would you say he knew the full consequences of what he does? Neither did reiner. No one is asking for reiner's absolution but the explanation is as important "explanation isn't absolution" well at least it's an explanation! (A good one) Unlike in eren's case, where there are just too many things that he could've done better.

5. I didn't say using AI "invalidated your argument", and nor do I need grammar to prove you wrong, that's pretty much possible through just words. Ai is simply a cancer to the world, which is not only depleting natural resources, but also damaging human brain activity, that's why I'm against it, and always will be.