Causing the biggest genocide in the history of mankind which also happens to involve mostly Bretonians on the death count.
Invading Edinburgh and trying to settle in Gaia, the one place Gaians don't want people to settle in.
Killing tons of Gaians while trying to settle Gaia and during the war in Taus.
Pick one, any of these or all should be enough reason for Gaians volunteering with Maquis to brutally murder Royalist remnants. Also all of this happened off-screen for you, as you already left Disco by then I believe.
There's also the little known fun-fact: the first sirian station to fall to the GRN onslaught was a Gaian base. Suffices to say anything Royalist happening in the Hebrides is Gaian business.
I really shouldn't have to beg for us to be included in the potential finale of what has been our sole story thread over the last 20 odd inRP years, but I guess some things never change, do they?