[quote=@Nate1008]
Yes, Yes, Yes. The Infestation does not care about their diplomatic stance. They have no use for allies and, if they cannot be trusted anymore, some infested will allow themselves to get captured. Later on in prison/lab/ship, they break out and infest it too, continuing its spread. They could not care less for their temporary allies and may abandon them in the middle of battle and make believable excuses to prolong their "alliance". In addition, they may Infest important people in a nation and pretend like everything is fine while the infested person changes things in law/military/information in negative ways. Basically political sabotage.
[/quote]

That's a fast way to antagonize every other faction... It will turn your infestation into something hunted across the galaxy and shown little mercy. As for your infection being able to reach the higher-ups, I very much doubt any player will willingly just give up their key figures of their faction. It will be an uphill battle on all fronts.