Board Thread:Manga/@comment-27321453-20180408230628/@comment-27125793-20180416232324

Yes, they did have that policy, but it what they did wasn't just for the world, but for Marley and the Eldians in Marley too. Titan warfare was losing its edge, putting Marley, and especially the Eldians in danger, since their usefulness would run its course, not to mention the fact the whole world hates them. With the production Willy did, he presented Eldians of the mainland more like victims, and diverted the world's animosity away from Marley due to their years of colonization. Paradis hadn't been an immediate threat in the eyes of the world, but Willy put it back on the spotlight, all the while allying Marley to the rest of the countries.

Yes, only the royal bloodline can use the Founding Titan, but Eren did use its power, and in Reiner's presence, who reported it to the Marley officials. Therefore, they're afraid Eren has found some way to bypass that prerequisite and would use it against the world. Whether or not he's actually going to do it doesn't matter, because Marley and everybody else aren't going to take their chances with the whole of Earth's population at stake.

The nuke comparison is apt, but I imagine that's what they're hoping for, because that means fewer lives lost on their side. It's not like they'd make an effort to play fair in war. I admit I wouldn't, and those international laws they have probably don't apply to Paradis, not in the eyes of the world. The Wallians killed civilians, dignitaries, and even children in their ambush, so it's fair game either way.

The Tyburs needed to intervene because unlike Marley, they have good relations with the political families and parties of other states. The Marleyan government alone did not have the clout, influence, and capability to convince everybody to band together, and most importantly, it didn't have the knowledge of the truth about the Great Titan War to use to their advantage. Even if the Tyburs had told the government, the animosity of the other countries would make the whole operation an exercise in futility. Again, the Tybur family was well-liked and respected, and they'd been neutral thus far, almost as if they were separate from Marley. Willy was the only one who make the plan come to fruition.