The standard is black and white, the practical is subjective

This thought just occurred to me the other day.  It may be wrong but the concept is intriguing.  It seems that we as Christians want to appeal to our faith as a hardline, written standard.  A line in the sand which one finds themself on either side.  But when it comes down to simple, practical living, everything seems to fade into shades of gray. 
We are told never to judge anyone or to presume to know what someone else is doing and what they ought to be doing. We are told to mind our own business and never think we are better than anyone else. 
This is not to say that sin is winked at or coddled.  Sin is sin and needs to be confessed and repented of.  But again, other people's sins are not our business.  That is between them and their priest.
So practically speaking, sin is sin but we need to love others and think the best of them, even to the point of not considering others weaknesses and downfalls.  We should think of others as not sinning but having a reason for what they do, something we may not understand.
I guess it's all about humility.