"For once let's have no fatuous rhetoric about 'healing.' A day cannot live in infamy without the nourishment of rage. Let's have rage. What's needed is a unified, unifying, Pearl Harbor sort of purple American fury—a ruthless indignation that doesn't leak away in a week or two…"  – TIME

As we can see from the above statement, Jeff Kluger has in mind another convulsive episode like Pearl Harbor or 9/11 that will unify the "anger" that Americans feel.

Kluger seems to imply that this anger is stemming from current elections. His concern is that it is spilling over into other areas of life.

If every offensive, unjust or insulting incident turns into a jolt of high-fructose fury mainlined straight to the brain's amygdala, what's left when there's a truly right and righteous reason to rise up in anger? And those important moments do occur. 

Kluger seems to be saying that anger has become fashionable and applying anger liberally trivializes it.