With the increasing of doctrine of the white lies justification in churches nowadays (for it is as if there's either this, or cowarding out of society into seclusion), this scripture if resounding more and more in my heart.
From the meaning of the whole chapter, I believe I can even quote verse 6 by replacing one word:
Psa 5:6 Thou shalt destroy them that speak WHITE LIES: the LORD will abhor the bloody and deceitful man.
Because only this type of "leasing" speakers flatter with their tongues. (v. 9). And to further justify their stand, they cannot be faithful in their mouth, corrupting their very soul. They may claim whatever "good cause" their goal is for, but their very act is a display of their distrust in the Lord, as if calling God unfaithful. Thus, they would want it to look like their distrust is justified in their own unfaithfulness.