http://revach.net/article.php?id=428

Section: Taryag Mitzvos   Category: Taamei Hamitzvos
3 Reasons Why Hashem Wants To Distance Us From the Dead? - Mitzva # 398 Parshas Chukas

The Torah is stricter with the Tu'mah of a Meis than with any other Tu'mah. The reason for the stringency says the Bechor Shor is so that the relatives of the Meis will not spend too much time with the Meis and go overboard with their mourning. Alternatively so that people will not transgress the prohibition of making requests of the Me'isim or of using a Baal Ov. Another reason is to protect the dignity of the Me'isim so that people will use the skin to make leather flasks or to use the bones to make utensils.