The genealogy of Cain

Adam’s lineage in Genesis, chapter 4:17-24, mentioned the descendants of Cain first.  All of a sudden, this wandering tattooed Cain had a wife, who was nameless.  Where did she come from?  Where did he get a wife?  She was either his mother Eve, or an unnamed sister from Adam and Eve, or his niece from Abel, but there was no mention of Abel’s descendants.Cain could have had sex with some animals as part of some evolutionary movement.  You cannot be literal here.  Obviously, this was just one family among many other families.  Some other females were involved, but where did they come from?  We do not know.  The first city was named Enoch after Cain’s only son, probably in the land of Nod.  Although there are more people called Enoch in biblical literature, this is the only mention of his three descendants, Irad, the son of Enoch, Mehujael, the son of Irad, Methushael, the son of Mehujael, and Lamech, the son of Methushael.  After six generations, this story got a little more complicated.  There must have been a lot of incest or family sex, since there is never any mention of other families.  Lamech, whose name appears 11 times, got special attention, since he had two wives, Adah and Zillah.  Adah had two sons, Jabal, who represented the wandering style of living in tents with livestock, and Jubal, a musician.  Neither of these names ever appeared again, but Adah appeared 8 times.  Now Lamech’s other wife Zillah had a son and a daughter.  The son Tubalcain worked with metals, while his sister was called Naamah, the first named female after Eve. These three people only get mentioned in genealogies.  Lamech killed a man who wounded him saying and chanting that as the descendant of Cain, he would have vengeance “seventy-sevenfold,” not just seven times like his ancestor Cain.  Violence was a way of life.  These descendants of Cain were technologically advanced.  They seem to have started urban cities such as Enoch.  But who else was around to share these cities with?  They were into music such as lyres and pipes as well as metal working in bronze and iron.  They appear to have had a culture where human achievement was rewarded.  Somehow, this genealogy ended with Lamech and his killing.  These were the skilled but killing people, the descendants of Cain.  Would they be the bad people?