That idea is marred when the GMs' first reaction to just that multinational cooperation is the simple erasure of an entire city's fortification, the magical transportation of a major army away from their destination near the rendezvous point, and the ambushing of another army moving to rendezvous with them. The effect of these actions is the GMs informing the players that weeks of plans and diplomacy and information sharing will not be allowed to affect the invasion. Any attempts to do so will be dealt with. The GMs have a plan and the players will not be allowed to change it.
You may have made a few assumptions and jumps to conclusions as to the degrees of pre-planning and happenstance involved in those events. And relation to humanity's actions. Invasions are meant to be tough and yes, the Netherworld is working against humanity, but not everything is a conspiracy.
I think sharing your perspective on the experience of the past invasions is good insight.
