Why?  Even as a former volunteer fireman, I find those solicitations overly aggressive.  I don't care what your 'cause' is, that should not give you the right to intimidate me into supporting it by impeding my lawful business.  I support a few non-profit organizations; none of them get to stop traffic to get a donation from me or anyone else.  What is so special about the 'cause' of the fire fighters?  That it was chosen by them or Mayor Piercy or the City Council?