Despite the fact that his crime merited the death penalty, it must always be remembered, the Torah enjoins us, that this individual was created in the image of the Almighty. His remains are to be treated with respect. He is deserving of a quick and dignified burial. The human being even in disgrace and calumny is to be seen as the manifestation of God's presence on earth, and under all circumstances is to be dealt with, with a sense of compassion and respect. The same respect given to the person of the human being should also be accorded his property.
Property has sanctity attached to it.
Ultimately all property belongs to the Almighty. We are its caretakers and guardians. The Almighty's beneficence and mercy are applied also to the animal kingdom. Just as he is merciful so should you be. Just as he is kindly so should you be.