That's because of the systems of the Matrix itself. The Game of Poverty is a Game designed to impose Poverty on all of the players.

Our overall goal is to eliminate poverty. The Archons are the NPCs that we are secretly fighting against. Their entire purpose for being is to impose Poverty upon us using any means necessary including war, murder, theft, disease, famine, etc.

So when beings align themselves with the goals of the Matrix and work with the Archons, the entire game begins to work for them. This is why evil seems to be stronger, because the system will facilitate their evil. But when you subject yourself to ally with the system, you are fully subjected to the system as well, and eventually that system is going to eat you up and spit you out even worse than if you never decided to ally with it. The system doesn't want or need allies, they only accept allies because they know they can fool them into thinking that they are on their side, and then they stab them in the back later. Although those who ally with the darkness in this life might have an easier time now, they will seriously regret it in the future.

And once again it all boils down to Free Will, because we have Souls, it means we are fragments of God playing within the Game. Because we are all players, we can decide what we want to do.

Like I mentioned before think of this reality like an MMORPG, even though the goal in that game is to defeat evil, there are still plenty of players that decide they would rather camp spawn points and flight paths and backstab other players for their loot. Just as humans have that choice within a video game, so do the "Begetters" of God.
And just like an MMORPG, if you truly want to progress on to the next level of the game, eventually you have to band together into a party or raid group and take out the big evil and save the day, so you can move on to the next expansion pack.