I get it, the part that is weird to me is americans having so much one-way courage that they needed to pull their guns on a man who is... on fire! Do they think bullets can kill fire? Do they not know how hard it is to threaten anyone when your ON FIRE?

People willing to die for a cause have been known to strap bombs to themselves and take a lot of people with them.

Yeah bullets won’t put out the fire, but can stop someone who wants to die for a cause from getting near to other people. The only thing that can be known is the person is willing to die for a cause. What is unknown is the amount of explosives on their person. You would feel really stupid if that person started running towards you (or other people) and you left your gun in your holster.