Not just funding and aid. Never let a good crisis go to waste. Throw humanity in a state of chaos, we can already see the only overly hostile thargoids are in that one system. All the rest are doing their normal day to day scan and leave unless you have something they dont like, or you are hostile towards them. If the thargoids unleashed a space nuke on humanity, it wouldnt just be one system that is hostile while the rest pretend nothing happened. Are we to conclude the thargoids have no clue what happened in that one system, outside of the ones who are there?
Plus, just like with the last two trainwrecks, we can see commanders chose to help him over the opposition in the community goals, humans are a creature of habit. So long as we have the biggest stick we are happy, we have been like that since the dawn of man. Once someone or something else has the bigger stick, we want to upgrade to ensure ours is biggest again. Humanity aided someone who we thought was giving us the bigger stick, and instead we managed to get the stem of a leaf through all of that effort unbeknownst to us. He gave us a crisis. Every crisis in human history, the masses flock towards one person or one group who claim to have the answers, who claim to have the ability to fix it and be the protector and savior. With that comes power, with power comes control and the ability to do things one couldnt in the past. It is far fetched, but cant be overruled just yet. This guy had all 3 major powers fighting for him in that system. He unified 3 different powers.... who throughout history have, in one way or another, been at odds with each other. Power my friend, power.