Justice—do you rulers[b] know the meaning of the word?
Do you judge the people fairly?
2 No! You plot injustice in your hearts.
You spread violence throughout the land.
3 These wicked people are born sinners;
even from birth they have lied and gone their own way.
4 They spit venom like deadly snakes;
they are like cobras that refuse to listen,
5 ignoring the tunes of the snake charmers,
no matter how skillfully they play. Psalm 58:1-5
Lillie-Put 
Do unto to others as you would have them do unto you concept. I am sure most would use mercy to judge if the same judgment was to be meted out to them.
I think you are probably right. I think it is important to remember that in the Christian faith we will be judged with the same judgment wherewith we judge.