What is the wisdom behind invalidating ablution (wudu') upon eating camel meat, behind the obligation of both ghusl (ritual bath) and wudu' upon washing a deceased person, and behind making wudu' obligatory for one who follows a funeral procession?

Allah legislates for His servants what is in their best interest and benefit. A Muslim submits to the command of Allah and His Messenger, whether they know the wisdom behind it or not. There is no blame upon a Muslim for seeking the wisdom behind Sharia rulings. The blame, all blame, is in rejecting rulings if one does not know their wisdom. As for ghusl (ritual bath) after washing the deceased, it is recommended (mustahabb) and not obligatory. The ghusl might be to remove weakness from the washer's body. As for wudu (ablution) after carrying a جنازة (funeral bier), it is recommended and not obligatory. The wisdom behind this may be that direct contact with the deceased causes a sense of sluggishness, and wudu and ghusl bring vitality.