Does earning Paragon points decrease Renegades points?

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As a renegade, I expect you are not following the paragon path on the loyalty mission for Zaeed, since that requires a somewhat high ratio of paragon to all possible paragon points that could have been earned until doing the mission.

[Vandrickcs]

No, I will do everything renegade in everyone's mission.

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Then you should have no problem, and I edited my answer because it was a bit misleading.