I think folks have a rather narrow view of the playing field, and are ignoring several agents attempting to control the situation in New Eden.
The Factions, and CONCORD, need Capsuleers to maintain a competitive advantage against the Sansha, Sleepers, and Rogue Drones. However, the factions and CONCORD are also distrustful of Capsuleer motivations, and rightfully so. Thus, they bar the general population from playing with the internal politics and operations of the factions themselves, except through registered and carefully regulated Mission Agents. This keeps their defenses strong on the internal side of things.
Now, of course, Capsuleers can still wage war with certain factions. They can raid faction shipping, stymie faction war operations, even make factions lose territory. These factions set these pilots to negative standings and bar them from accessing their high-security space, at least as much as they are able.
So, you have two walls against capsuleer influence into Factions themselves, both on the friendly and non-friendly side of things. CCP has given us the opportunity to play as the independent, CONCORD-regulated capsuleers, who are licensed via accredited capsuleer schools throughout New Eden. This isn't a matter of debate, it's simply the design of the game. As such, we have significant liberties, but also restrictions, in our abilities to act.
Ask yourself this question: each capsuleer is effectively an interest group with massive potential influence and power. Does it not make sense, then, to channel this power towards external threats, away from the internal workings of your Faction, where you've carefully built up an architecture of power over the past four centuries? Capsuleers are too chaotic and rogue to intergrate directly into that schema, at least the independent, non-indoctrinated and internally-regulated ones anyway.