Correction. The Heretics aligned with the Reapers while the bulk of the Geth refused to support them.
They also made no effort to stop them or even dissociate themselves from them for the next two years.
No, but since you mentioned it, the leadership of the Quarians in the Morning War would certainly be sent to the noose.
Why? Because they tried to enforce Council law by decommissioning malfunctioning machines?
Please note that I agree (in hindsight) that they were wrong to try to shut down the Geth - my canon Shepard says as such in ME3. I do, however, find it hypocritical to condemn them for misunderstanding what they were dealing with, yet give the Geth a free pass for committing genocide because
they didn't understand what
they were doing (if that's even the case - the consensus mission suggests otherwise).
Reminds me of
this, got PM'd to me a while back:
I'd argue about considering the same for Xen and Gerrel as well considering their primary reason for the attack was 'We have a new toy and wanna use it."
They acted on the information at hand; I can't fault them for that. If Gerrel pressed the attack
after being informed of the upload and the offer for peace, though? My Shepard would want to tie the noose himself.
EDIT: Odd, trying to frame these debates in a "my Shepard" this, "your Shepard" that, kind of way...