As part of the machine-gestalt identity, the Geth don't handle the importance of other people's views very well. They don't understand the Heretics, or organics, but they have a hard time realizing that those groups likely don't understand them either. Fitting with the Geth's depiction in canon as factually smart but socially ignorant, a species still in its infancy, the Geth have a child's belief in that other people understand their intentions. What Geth think of as showing their desire for a no-hostility peace (not going elsewhere and making contact, defending their own territory), other species view with suspicion (because the Geth kill everyone who goes near to talk to them, like they have something to hide). The Geth are aware of their own limitations in understanding others, but don't quite get that others don't understand the Geth perspective as well. To the True Geth, is should be obvious they don't mean any ill will towards Organics: it is the Heretics attacking, after all.