Libertarian relativism?

One reader commented on the paragraph that ends” To draw the line anywhere on what is tolerable … is to take a step toward Auschwitz.”  Was this an example of liberal relativism?

I had – rather too hastily – suggested that there were limits set on tolerance by criminal law.   I should have taken the time to work through the delicate balance between tolerance (or, better, compassion) and justice.  Either is incomplete without the other. 

Over the past three hundred years a series of philosophers have developed the argument that justice makes universal demands: there is no escaping the obligations of justice.  Yet, as Martha Nussbaum has recently argued, humans in their everyday lives do not simply obey the universal, intellectual demands of justice, but must be motivated emotionally to respect those demands.  Compassion provides that motivation, even though compassion and justice might pull a person in different directions in some circumstances.  (A mother, for instance, hiding a miscreant son from the police.)

So while there are limits to compassion, it is usually compassion that motivates people to observe the demands of justice.