The Exclusion of Moabites From the Lord's Assembly

In Deuteronomy 23 verse 3, Moses stipulates that Moabites are strictly excluded from the Lord's assembly up to 10 generations. And why? Well, like the Ammonites, the Moabites trace their origin back to Genesis 19 when after Sodom and Gomorrah are destroyed. Lots of daughters deliberately get their father drunk so that the human race will not be extinct. So with such a questionable kind of incestuous origin, they are understandably excluded. Plus the Ammonite and the Moabitic live down to that reputation by the sordid things they do against the Israelites throughout history as well.