>>umanwi+(OP)
Police and security at festivals almost never take guns into them (it's almost always private security) as the chance of someone taking their weapon in the chaos is too high and discharging a firearm in a crowd has a high chance of hitting a bystander. Pepper spray and batons are standard practice (though, of course, there are always bad actors. These are the exception, not the norm).
EDIT:
Sorry. I should have stated that this is for liability issues more than any other reason, not out of any "goodness of the heart". Though, given the opportunity, most people will do the good thing rather than the out right psychotic thing, clinical testing has shown.