Aces used to be much more inclined to join weaker factions, to face other aces and balance the game. I don't think it happens often now, leading to players trying to win by numbers.
In my view its a natural outcome of imbalance of skill.
Only the aces can break the cycle that ends up in situations not enjoyable for anyone, with great power comes great responsibility.
Unless aces show some willingness to break up their cliques for the health of the game, ganking will remain the status quo.
I think it would be more enjoyable for everyone when aces take their responsibility, but at the same time its a game and people should do whatever they want (within the rules)
Back in the days anyone could hire the Reavers to balance a fight.