Remember that part where the earth illegally boarded that ship. And the Captain told them, get off my ship now, or I'm calling the Martians! They sure did leave that ship in a hurry. But only after they had killed one of the crew.
You have to admit the earth is acting like a bunch of Nazi Pirates. They keep talking about Venus, but I don't know where it fits into the equation. Has it already been terraformed in the series ? It had been in the second book. The earths own moon colonys are about to rebel against them also. Titan already has. Venus doesent have an army so they are somewhat neutral, so far.
Venus is the agriculture planet so that is where most of the commercial traffic is comeing and going. In the
books that is what the earth is trying to block, and hyjack. Sort of like a blockade, and it gets bloody out there.
It does bear a resemblance to our own civil war.