President Obama’s remarks Tuesday at a memorial service for police officers slain in Dallas last week should be a stand-out moment for his presidency, a time for him to help bring the nation together and heal after a horrifying rash of violence across the country.

But taking on the role of consoler-in-chief after a violent mass shooting has become all-too common for this president, making his task of soothing a nation on edge more difficult than ever.

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