By being in GDI, they are allowing Ryan to represent them on the world stage. GDI's nations implicitly support all of Ryan's actions simply by virtue of being in GDI, regardless of whether or not they have knowledge of one issue or another. Ryan is the one who they have trusted to have knowledge of these things and act on their behalf. Just as they would reap the benefits of Ryan's successes, they pay the consequences of his failings.