An Islamic insult. The sole of the foot (or shoe) is considered unclean and to show it or touch someone with it is a supreme insult.
That's my supposition as well.
Here's my guess - as he was dying, the youths hit him with their shoes. If one of our guys votes to give money to feed these monsters, I will vote against him. If a pol wants to enable these killers, they can do it with their own money.