Most of us are wary of synthetics but I do not think that they would initially be part of the Reapers. The Geth uphold life and don't like conflict, of course our galaxy is wary of AIs but I've come to find them incredibly helpful.

[She'll pause to gather her thoughts, hopefully no one is too stupid to try to attack any robots.]

Unfortunately it comes down to individuals and what they think of synthetic lifeforms. People are scared, so that only makes their prejudice worse.