My potentially spicy opinion about Owen and Chimera is that I sincerely doubt there was manipulation involved in making him believe the actual mission and ideals of the group, given that Owen was a government instrument who served king and country.
Like, we can call it whatever we want but the truth of the matter is that man would at the very least be a centrist (different countries=different political meanings but for simplicity's sake I'll use this).
Like. If we step back for a moment, neither Curt or Owen are "good people". They work for their countries. They have its best interest in mind, even when this conflicts a core part of their identity. They genuinely think they're doing good, they're saving the world, but what that actually means is serving the interests of their political systems. Human lives are expendable. The loss of life or the suffering of people is a lot of the time not visible to them. Do they stop to think about who suffers because of the interests they upkeep? Their successful missions? It's not just the guards one chooses to kill or not to kill. What about the common population? The poor? The immigrants? Anyone who the government each time deems unwanted? It's so easy to justify eradicating people who are "a danger to the world" when you're in that position, be it a guard or a rich fuck, or someone down the street.
Anyway, this got away from me. What I'm trying to say is Owen and Curt's job has some inherent implications. I love them to bits but sometimes it's a nice pastime to think of those implications. Anyway, Owen teaming up with Chimera willingly is one of the least surprising things to me.
(also I always have think it's funny when spy movies talk about "saving the world" and that means America or Britain lol)