Hey Yaro,
I've been trying to find something from the Jewish perspective.
This article
The Book of Judges: The Israelite Tribal Federation and Its Discontents seemed to bring out the overall point of the Book of Judges which I found in various supposed Jewish sites.
Excerpt:
So does Chapter 19, which begins the horrible story of the mass rape-murder of the concubine at Gibeah. According to this story, the base men of Benjamin assault an Israelite passing through from Judah to Ephraim and have their way with his concubine until she is dead. The wronged Israelite summons men from the other tribes to punish Benjamin.
Here for the first time since the days of Joshua all of Israel from Dan to Beersheva and from both sides of the Jordan is presented as assembling at Mizpeh to punish the Benjaminites. The processes of federal governance described in Chapters 20 and 21 to close the book are of special interest, giving us a glimpse of the tribal federation in action in that epoch, first to respond to a case of wantonness and wickedness and then to preserve the intertribal dimensions of the edah.
I did find a few sites that compare the sin of Sodom (considered to be worse) with the sin of the Benjamites.
IMO though the political spin is probably more the point of the book of Judges.
"The average man does not know what to do with this life, yet wants another one which lasts forever." --Anatole France