Okay, what is the double standard and what is the false set of scales? Since Christ spoke out vehemently against hypocrisy, then the one thing that God is not, is a hypocrite. We may misunderstand what He meant for us (as I am sure that we do), but He is not a hypocrite, nor unjust. Perhaps your definition of justice does not include that this justice be tempered by mercy... but perhaps THE definition of justice is just that; tempered by mercy? Just think about the end result on a worldwide scale. Eye for eye would ruin us all - or at the very least, NEVER, put an end to wars, hatred, revenge-seeking. There would never be peace.
Plus, God expects us to show mercy; even as we are shown mercy by him. "By the measure you use, it will be measured against you."
The difference between is that we cannot read another's hearts (nor are any of us without sin that we can cast the first stone), but God can and is both of these.
Peace,
Tammy