Yet they never seemed nearly as crucial to him as the question of kindness and good manners.
It made as much sense as anything else, and Yossarian was willing to give Orr the benefit of the doubt because Orr was from the wilderness outside New York City and knew so much more about wildlife than Yossarian did, and because Orr, unlike Yossarian’s mother, father, sister, brother, aunt, uncle, in-law, teacher, spiritual leader, legislator, neighbor and newspaper, had never lied to him about anything crucial before.
There are no more uses of "crucial" in the book.
Show samples from other sources
Doing well on the SAT is crucial to getting into the college I want to attend.
The information is crucial to making a good decision.