Not curing the Genophage: The reason you're a heartless monster.

Just shows that the majority is head-in-the-clouds naive of course, or lets sentimentality drive their decisions.

If we are going to talk genocide though, then the Krogan aren't innocent of that either.

Rather than push the Rachni back to Suen and contain them there, the Krogan elected to actively hunt down and kill every last surviving member (that they knew of) of a clearly intelligent, space faring species. The outcome of the Rebellions could very easily have followed a similar course of action, especially considering all the crap that the Krogan pulled during their little war, but the rest of the galaxy elected to suppress and contain them rather than flat out kill them all.

The Genophage might be a genocide from one point of view, but so was the Krogan killing of the Rachni. Plus, at least the Genophage has some merit to it, namely to keep the population in check, the complete scouring of Suen, served no purpose, save to satisfy the Krogans' bloodlust.


EDIT:

Plus, it's not like the Krogan had a great sense of care placed on their own numbers before the Genophage. Their previous battle tactics literally consisted of sending wave after wave of their own forces at the enemy to drown them in sheer numbers. If anything, the Genophage forced the Krogan to recognize the value of the individual members of their society rather than treating them as disposable bodies to throw into the meat grinder. 

Which is why the sabotaging of the cure choice is so laughably biased.

You are right that the final decision is obvious, because BioWare can't apparently write a moral quandary without make one side look like Snidely Whiplash. As presented in the background lore, the Genophage and it's deployment was a nice grey issue; both sides of the discussion had good points. But, flash foreword to ME 3, and suddenly all of that nuance is gone, you are forced to either treat the Krogan as blameless victims, caught in a racist plot, or side with a cartoonishly shallow Salarian Dalatress, who's whole argument is summed up with: "I hate the Krogan and want to see their dead babies." No, I don't view the act of sabotaging the cure to be a worthwhile platform to stand on, because the very nature of the choice is designed to make players who choose to do it specifically look like racist d-bags for daring to go against the narrative and the feelz for the Krogan.


Now where I would make my argument is the beginning of that arc when Wrex/Wreve forces the rest of the galaxy to put the Reaper war on hold so that they can all play doctor and cure the Genophage. This, despite Wrex's (if alive) promise of unmitigated aid in ME 2. Here we are, fighting for the lives of everyone in the entire galaxy (including the Krogan), and he has the audacity to call for a cure "or else". What if, during the time it took everyone to finish running around on Tuchunka, Palaven fell? The entire bulk of the armed forces needed to escort the Crucible, wiped out because the Krogan decided they wanted handouts and restitutions up front? It's not like the cure, and the resulting babies from it would have made any difference in the current conflict with the Reapers.

You could say that Wrex/Wreve needed to make the demand then, otherwise the Genophage would never have been cured, but that is complete nonsense. The Rachni queen immediately sets out to help the galaxy in their fight and she doesn't have to deal with people trying to kill her off after the war; indeed the Rachni are given their own planet(s) and left to their own devices. Who's to say that the galaxy wouldn't see the brave, selfless acts of the Krogan as more than enough justification of the cure? Instead, the rest of the population is held a figurative gun point and forced to cow tow to the demands of a leader so petty as to doom everyone to extinction if he doesn't get his way; I'm real sure that that will garner loads of goodwill with the post-war galaxy. 

I agree with all of this within its context and i'd say that the forcing of the Salarians hand is where the story becomes openly biased. Even with the Primarch attempting to delay the wait, almost begging there is an element of arrogance and cruelty ftom Wrex. But at the same time it's the Primarch requesting Krogan aid. The alliance needs Turian aid and is assisting the process in exchange for the latter (Which means technically it's not even Shepards decision.). I wont make real world comparisons. But the Krogan are a bargaining chip once more and Wrex is wise to take advantage.