OPINION — This week marks the 50th anniversary of that electrifying moment at the summer Olympics in Mexico City when Tommie Smith and John Carlos, accepting their gold and bronze medals in the 200-meter dash, each raised a black-gloved fist in a protest of racism and equality in the year of the “Olympic Project for Human Rights.”

They are now immortalized in the Smithsonian’s National Museum of African American History and Culture and by a sculpture at their alma mater San Jose State University — their bravery noted, their impact on society acknowledged.

But in 1968 — the year of unrest, war and the assassinations of the Rev. Dr. Martin Luther King Jr. and Robert Kennedy — the two athletes were vilified, kicked out of the Olympic village and banished from their sport, returning home to cold shoulders and death threats.

Taking a stand on ideas that buck the status quo is seldom appreciated in its time — especially when practiced by certain U.S. citizens. Those who tell Colin Kaepernick to be more like King forget that when he was murdered, King’s disapproval numbers approached 75 percent. The years have burnished the reputation of the civil rights icon with a federal holiday in his name and current 90-plus percent approval.

That is par for the course of history.

It is something to remember as Republicans try to brand dissent as mob violence, a message led by a president who found “fine people” in an actual mob of white supremacists and Nazis who killed a woman, someone who whips his own rally crowds into frenzied bliss with calls for retribution against dissenters (answered by his fans with an occasional cowardly sucker punch to the face).