We find at the end of this weeks Parsha the Mitzvah of Aray Miklot, cities of refuge that were created for Benei Yisroel. Of the six cities half of them were to be placed in the territories of the two and a half tribes on the eastern side of the Jordan. It would seem that their separation from the Kiddusha of the rest of Yisroel caused them to have a greater incidence of murder in their midst. But there is a deeper understanding to this. When Benei Reuvein and Benei Gad agreed to fight along side the rest of Klal Yisroel they volunteered to remain even until the lands were divided to the nine and a half tribes a period of an extra seven years that Moshe never requested. This means that for fourteen years the children of these two tribes grew up without a father. This created many children at risk and was the cause of much bloodshed on the other side of the Jordan and the subsequent need for the additional Aray Miklot.
The last Mitzvah in Sefer Bamidbar is the Mitzvah of driving out the residing gentile nations of the land. The Torah warns that if you do not remove them they will constantly be a thorn in your eyes. This was a lesson never learned, as we see today, much of the non-Jewish element in the land of Israel is far more than a mere thorn in our eyes.
Chazak, Chazak V'nischazek