This needs to be amplified + defensive caveat regarding subscription to any “youtube” theories. That said, a member of a large organization, such as the US military, will have many stories to tell and phrase “FUBAR” iirc came out of the US Army. In fact, even being in smaller commercial enterprises, one sometimes wonders that anything gets done at all!
But things get done. The military can plan, provision, conduct, and win wars. Systems tools and state-spaces are the tools of top level control mechanisms. So, yes, things can be chaotic when viewed from a narrow perspective, but from another top level perspective, there is order.
It's really hard to turn back on the "but realistically, conspiracies are uncommon" brain when exposed to the fact that actually decades-long conspiracies do actually occur and produce results.
As you said, you don't send people into the street to yell at other people how the soviets are evil and we need to arm up. You rather plant ideas into the heads of a few influential people in hollywood, then give them cool toys and props for the movie, and let it roll downhill from there.
This is similar to work - and we're not large with ~150 techies in the company. But it has grown impossible to directly steer all different teams. Instead, you have to see that the right trailblazing teams are going into the right directions and possibly make sure that service requests moving into the right direction are quick, and service requests moving in the wrong direction.. well either roughly stay in the SLA or get blocked.
After living for a few more decades you get a lot better at power plays.
We like to think that big execs and leaders are some super smart geniuses when we're not disparaging them (and they may be, but only in specific areas), but they're still just people, and they are afflicted with jealousy and envy and spite and lack of forethought just like the rest of us, and they make mistakes accordingly. They particularly make mistakes when you're trying to organize a big group of people.