Mh... thats a bit like "A gun is not killing other people, its the person firing it".If they are hired as mercenaries, it's a trade contact and defenitely shouldn't have consequences, since the empire per se is neutral and is only selling their arms at the best payer, as there aren't with today's mercenaries. On the other hand, if it-'s some kind of military support like it happened during WWII or the Spanish Civil War, then yes.
I dont know, if someone is selling toxic gas or atomic bombs to someone who uses it to kill your people and your family, wouldnt you be a bit... I dont know... furious with the person who sold that stuff? Or would you say "Ah no, its ok, its just a commercial venture of some sort"?
After all its not some dubious pirate stuff, its the pride of your navy.