It should seem, that the vengeance taken of the men of Jabesh-gilead, was more with an eye to provide in this manner wives for Benjamin, than to punish them, for not coming up against Gibeah.
Judges 21:7-14
7 How shall we do for wives for them that remain, seeing we have sworn by the LORD that we will not give them of our daughters to wives?
8 And they said, What one is there of the tribes of Israel that came not up to Mizpeh to the LORD? And, behold, there came none to the camp from Jabeshgilead to the assembly.
9 For the people were numbered, and, behold, there were none of the inhabitants of Jabeshgilead there.
10 And the congregation sent thither twelve thousand men of the valiantest, and commanded them, saying, Go and smite the inhabitants of Jabeshgilead with the edge of the sword, with the women and the children.
11 And this is the thing that ye shall do, Ye shall utterly destroy every male, and every woman that hath laina by man.
12 And they found among the inhabitants of Jabeshgilead four hundred youngb virgins, that had known no man by lying with any male: and they brought them unto the camp to Shiloh, which is in the land of Canaan.
13 And the whole congregation sent some to speakc to the children of Benjamin that were in the rock Rimmon, and to call peaceably unto them.
14 And Benjamin came again at that time; and they gave them wives which they had saved alive of the women of Jabeshgilead: and yet so they sufficed them not.