I think celebrating in the streets (and on the internet) dog-whistles approval to the people who are willing to do things like this:
Maine Mosque Vandalized Following Bin Laden Death
On Monday in Portland, ME the walls of the largest mosque in town were spray-painted with "Osama today, Islam tomorow [sic]" and other phrases, sometime following morning prayers on the day after American forces killed Osama bin Laden in Pakistan.