User blog comment:Milky544/Jack and Miranda./@comment-1829604-20100520130933

It depends on how many missions you took before that point. You can do their loyalty missions earlier and pass it with 2.5 blocks of paragon/renegade. How the system works is that it counts how many paragon/renegade giving choices were offered and how many you actually got. To illustrate, on Omega, you can collect 60 points of paragon but you might have only 45 of them, An easy situation might require 25%, a medium 60% and a hard 90%. This stands for all visited location, including the talks on the Normandy. Of course, boosters like special helmets might help. I had similar problem: before Kasumi, my playstyle and order always allowed me to pass the confrontation; but with Kasumi, I failed because I lacked 15 points (figured out with the save editor :)

See the Morality_Guide_(Mass_Effect_2) for points.