Rebellion must be exterminated.
They bring death and destruction to Shaper lands.
Creatures created by the Shapers must obey Shapers, and there is no excuse for them for killing the citizens of Shaper Enpire.
That means the rebellion is a bunch of criminals, because of them tens of thousands were robbed, raped, tortured and killed, they began the war - the most horrible crime against humanity.
Such filth must be destroed in real life, and in G-series i prefer to crush the rebellion without "switching the sider to earn some artifact or exp". After all it is a roleplaying game
P.S. -In G5 Alwan fraction seems the most adequate and clode to my understading of right and wrong.