Alternatively, considered another way: Lysander may very well dislike Hireshmont. But I don't see Lysander launching an attack on Terran anywhere. The line between "quietly despise" and "11,000 CS of soldiers attacking you" seems, to me, to indicate that something more happened, I just have no idea what.
Luria has had four civil wars, and I don't think
anyone knows the real reasons for each outbreak. Perfect information would be nice, but perfection is hard to obtain.
