User blog comment:JediSpectre117/Council not helping in ME3/@comment-2250460-20110921060626/@comment-118213-20110921152901

Another reason they didn't help with the Colectors was that humanity had been given a place on the Council, (or in another scinaro lead or dominated that council), and that place on the Council meant that they should be able to deal with their own problems. Since the attacks on human colonies took place in the Terminus systems they can't have found it difficult to believe that it could be a unrelated problem. Their is also the added fact that Commander Shepard is working for/with Cerberus - who are a known anti-alien group, and terrorist organisation.

I do have to say, if you look from anyone but Shepard and her squads perspective when she's going on about the Reapers its easy not actually that easy to believe. Serren is a master manipulator, and only Shepard had seen evidence of the reapers. To someone who has no evidence, whats easier to believe?:

or
 * Seren is in league with an ancient AI-dreadnought who is seeking to bring his kind back to the galaxy and destroy all intelligent life in existence. On top of this, their all suddenly supposed to believe that the Prothians didn't creative the Mass Relays or the Citadel as their entire history had said instead these sentient machines did, millions of years ago.
 * Seren, has acquired a massive dreadnought, possibly built by the Geth, and is making an attack on the centre of galactic power. The Geth, have in the past overthrown their masters and evicted them from their own planet.

Personally, If I didn't know better, 'B', sounds far more likely and A does sound a bit like the story of a doomsayer. On top of that which would you want to believe? B again, there you have a clear conclusion. (The attitude of the Turian councilor is also explainable since allot of humans have the same attitude to his kind.)