Way off in tangent land now but: while much of "ufology" is indeed silly, "the aliens are here but they are not communicating" is a valid hypothesis for the Fer

Way off in tangent land now but: while much of "ufology" is indeed silly, "the aliens are here but they are not communicating" is a valid hypothesis for the Fermi paradox (with or without FTL). There are numerous rational reasons that an intelligence exploring the universe might choose to be very very careful about initiating communication to the point of taking steps to avoid even accidentally revealing itself. Some of these are altruistic (e.g. prime directive and contamination concerns) and some are self-interested (see game theory, and consider the apocalyptic destructiveness of conflict between really advanced intelligences).