Word for pretending as though you have done right?

Solution 1:

Consider dishonest, deceitful, or unscrupulous.

unscrupulous: Devoid of scruples; oblivious to or contemptuous of what is right or honorable.

(AHD)

Both a decision and a decision-maker can be unscrupulous.

Solution 2:

skewed

: distorted or biased in meaning or effect

American Heritage® Dictionary of the English Language

Also, consider twisted and slanted.

twisted: having an intended meaning altered or misrepresented

slanted: favoring one person or side over another; "a biased account of the trial"; "a decision that was partial to the défendant"

Solution 3:

I would have thought prejudicial would be the best fit.