Well the FWC are a military corporation that have been around for thousands of years, they created a machine that could let people see into the future and they saw a war coming that would destroy humanity, they prepared for it along with the warminds (no idea who made them) and now they are preparing for the next coming war. Why not be prepared? Better safe than sorry. I don't think New monarchy's ideas are good because they want to have a dictator over the city (that means no vanguard commander zavala is cool, not to mention the vanguards defended the city) and finally dead orbit just wants to build a fleet and leave earth (because you know the reef is proof of how well that worked the first time)