As noted above, it would not be canon law per se that would be defied in any case, but in another sense, the will of the legislator (i.e., the pope) who established the law. Yet there is more, of course. What are we actually obeying and who and why?
The law itself expresses deeper realities from which it is based. It is purposeful and it arises from Revelation and Tradition of the Church. Take a look at the document by which the present code was promulgated:
vatican.va/holy_father/john_paul_ii/apost_constitutions/documents/hf_jp-ii_apc_25011983_sacrae-disciplinae-leges_en.html
Why was the code promulgated? What purpose does it have in the life of the Church?
Perhaps it may expand or aid your discussion to also remember that there is a variety of types of law (something similar to literary genres) in canon law and they express different kinds of values. Knowing the type of law and its underlying values helps uncover why a particular law was promulgated.
Some laws impose duties, some assert rights. Some duties are heavier than others. Some rights are stronger than others.
Some laws encourage or recommend.
Some absolutely prohibit things being done, or may introduce the possibility of a penalty if they are done.
Some laws are a matter of keeping good order.
Some define or explain channels of power or authority in the Church, how power is obtained, and how it can be used.
Some set forth what has to be done for an action to be valid or for a person to have the capacity to do something.
Some are theological or magisterial expressions.Some have a basis in the moral teaching of the magisterium.
Some explain the fundamental notion of something in the Church so that you know what it is (e.g., a parish, a diocese, a personal prelature).
Some are expressions of divine law or very directly based on it, or promulgated to protect the observance of divine law.
Some are procedural (such as how to take votes or how laws come into existence or pass out of existence).
Some of these laws are not exactly matters of obedience. Some are fairly neutral (such as the computation of time or the definition of the age of majority).
So you would want to look at a particular law, and attempt to understand its type and discover the underlying principle. You would also need the context of the law and an appreciation of similar laws.
For example, in the question of parents delaying the baptism of children, you would also consider what baptism is, what it does, what its basis is in the theology and belief of the Church, what the duty of parents are. What values in Revelation and Tradition does canon 867 seek to protect and promote?