Mutual relation of modifiers

When analyzing arguments, it's important that you look for obvious errors in logic, such as irrelevant evidence and careless comparisons. However, in addition to errors in logic, you also need to determine the author's underlying assumptions, or beliefs, about human nature and the world at large. Unstated assumptions about what's right or wrong, important or unimportant, often form the foundation of an argument.
[Source: Reading for Results Ninth Edition by Laraine Flemming]
I'd like to know here if what was unstated is whether assumptions are right or wrong and important or unimportant, not the very assumption.
Thank you in advance for your help.