The bold words can basically be omitted without drastically changing the meaning of the paragraph. The connotation of these bold words is that there is no logical "path" of reasoning that would not require you to acknowledge the fact that follows (namely that containers, shelters and supports must be functional); you could not reason logically given true facts and come to any different conclusion.
As far as understanding terms similar to this, there is no one reference other than sites like this one that provides all this information. It is implicitly understood by creative and technical writers alike that their audience, in most cases consisting of native English speakers, will have a certain amount of "common knowledge" of idioms and idiosyncrasies used in language, gained through immersion and experience in the everyday English language and culture. This is one of those instances. Unfortunately, to those for whom English is not their first language, or who are experiencing a different parlance for the first time, these can be missed or misunderstood.