WASHINGTON — The prevailing images of protests in Baltimore and Ferguson, Missouri, over police killings of black men were of police in riot gear, handcuffed protesters, tear gas and mass arrests. The main images of a fatal gun battle between armed bikers and police in Waco, Texas, also showed mass arrests — carried out by nonchalant-looking officers sitting around calm bikers on cell phones.

The firefight in Waco is raising questions about perceptions and portrayals of crime in America, considering the vehement reaction that the earlier protests got from police, politicians and some members of the public.

Media critics, columnists and civil rights activists are complaining that there appears to be little societal concern about the gunplay at a restaurant in Texas, whereas politicians — including President Barack Obama — described violent looters in Baltimore as “thugs,” and the media devoted hours of television and radio airtime to dissecting social ills that affect the black community.

On Twitter, (hash)wacothugs and (hash)whiteonwhitecrime were trending, with columnists around the nation debating the differences. “So the mainstream media refuses to talk

The shootout at a Twin Peaks restaurant in Waco left nine people dead and 18 injured. About 170 bikers have been charged with engaging in organized crime, with bond at $1 million for each suspect. Mugshots show an array of suspects: white, Hispanic, a white woman and a man who looked black.