If anyone sees a fellow-Christian committing a sin which is not a deadly sin, he should intercede for him...Although all wrongdoing is sin not all sin is deadly sin. (1 John 5:16-17)
I must add that it seems crazy to me to need a Biblical justification to admit a distinction between horrendous, gruesome crimes and others that are less extreme. In 1983 in Illinois a mother and her three children were found dead in their beds where someone had used a long-handled axe to bludgeon them to death by swinging the blade into each of their heads from 10-15 times for each one of them. I cannot imagine that God views that on par with passing a bad check.