The moral obligation to avoid scandal is biblically based. Jesus warns the man who would lead the “little ones” into sin that it “would be better for him to have a great millstone fastened round his neck and to be drowned in the depth of the sea” (Matthew 18:6; cf. 1 Corinthians 8:10-13). He asserts that “temptations to sin are sure to come; but woe to him by whom they come!” (Luke 17:1). The Catechism of the Catholic Church defines scandal as “an attitude or behavior which leads another to do evil. The person who gives scandal becomes his neighbor’s tempter. … Scandal is a grave offense if by deed or omission another is deliberately led into a grave offense” (2284). It is clear, then, that in both Scripture and tradition, scandal is a serious issue and something to be avoided.
What is not clear, however, and what is not defined, is what constitutes scandal and how are claims of scandal to be justified.
Source: National Catholic Reporter