Blude's thicker than water

When Sir Walter Scott said "Blude's thicker than water", I wonder if he thought of the phrase based on acceptance (on what is and should be complete acceptance within a family) or perhaps he was referring to loyalty or even love. Also, did he actually mean "outsiders" can't accept/have loyalty/love as much as family would?

Is one who truely loves another- more likely to "accept" *everything* the person is- whether or not certain actions are *right*? Put another way- could complete acceptance in the name of 'love and family' sometimes lead to a *compromise of conscience*?

Where then, does 'tough love' come in- where one needs to pull up another out of a deep love/concern for their well being? Does it mean, this person who pulls up another out of concern, has a lower acceptance? In which case, would I prefer a lower acceptance (or tolerance) of my behavior from one who loves me, rather than 'complete acceptance' and a 'free hand' based on compromise?

Now where does 'judgement' fit in? Can one not judge another, and still demonstrate a low tolerance to an action that is wrong? Is low tolerance construed as 'judgement'? And if tough love is a right approach to a beloved, won't it at some level imply judgement and/or 'non-acceptance'?

Perhaps it finally comes down to the approach one takes when dealing with another; one can hold another and still correct the person's wrongdoing; perhaps that is acceptance- like how a parent would hold their child and tell them what is right or wrong;

-- thoughts of a friend