
What's more... the genophage cure isn't permanent - the salarians "fixed it" once, and you're assuming that they'll just ignore the growing krogan threat this time round.
Worse, at that time you're situation is a little bit more desperate - Hacket ordered you to get the turian fleet at any cost. The turians want krogans, who in turn want the genophage cured. Alternatively, you can side with the dalatrass and hope that Hacket doesn't notice that the turian dreadnoughts he needs are actually decoys... You cure the genophage (to get turian support), or die. It's really quite simple (Conveniently, it's a Bioware game so this choice - and all other choices as well - have no impact on anything. Yay!)