While it may be based on what is technically fiction, my views on the Drake Equation were modified to include a “caution in outbound communication factor” of fairly low probability after reading Cixin Liu’s “Dark Forest”.

SPOILER ALERT for prior novel: it convincingly argues that, due to the impossibility of trust across otherwise unrelated civilizations, the rate of technological progress in any given civilization compared to the speed of travel between star systems, and the long-term understanding that resources are limited, and outgoing communication to another intelligent civilization inevitably results in attack and likely elimination of said civilization.