justifications

Lord Mansfield, an English Judge of the 18the century is said to have advised a young governor in the following manner:

Consider what you think justice requires and decide accordingly. But never give reasons for your judgment/decision, for most certainly your judgment will be right but your reasons provided will be wrong.

What he was trying to convey was that one's judgment need not be reported with a reason, the reasons should be kept private or for that matter discrete.

People often tend to qualify their judgment with a reason perhaps we humans require to justify our actions. Well we as humans want to do right or be just.
Which is why post any war we humans justify all that massacre with humanitarian aid.

Any decision given our limitations of experience and knowledge would be one that is comparatively right and not one that is perfect or ideal. And this comparative perfection can be rendered imperfect.
Lord Mansfield here is advising his young patron against providing the reason of justification even if our judgment is right.

Err a justification & that judgment will tumult.