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What responsibility do US presidents have to set the tone of public discourse? President Trump says his supporters don鈥檛 want him to ratchet it back 鈥� but critics say the presidential megaphone comes with an obligation.

A notable reversal happened between the last US election and next week鈥檚 midterm election: Democratic candidates are embracing health-care reform, while Republicans have gone on the defensive. What鈥檚 that all about?

The quest for a safer world in the nuclear age takes different paths depending on the country, the weapons, and the circumstances. Our writer looks at wobbly arms-control treaties and their role in security today.

If a robot takes your job, it probably doesn鈥檛 feel like progress. But history and economics show that this kind of progress creates more 鈥� and better 鈥� jobs for people.

In Canada, Halloween is now a major holiday. Our reporter discovers that in her neighborhood, it鈥檚 fueled by a desire to build a sense of community.

One of the world鈥檚 most successful efforts at persuading terrorists or would-be terrorists to 鈥渄isengage鈥� from extreme militancy is in Denmark. The program aims to prevent Muslims from being radicalized and to reintegrate those who abandon terrorism back into society. But the approach could apply equally to almost anyone lured by a violent ideology 鈥� including Robert Bowers before his attack on a Pittsburgh synagogue.

His radicalization toward anti-Jewish white supremacy has many causes, including the rise of hateful rhetoric in social media and politics. Yet it is just as important to focus on the missed opportunities at preventing such terrorist acts.

Could Mr. Bowers鈥檚 murderous intent have been detected by family, friends, social media companies, law enforcement, or others? If so, what might they have said to him?

Would they have expressed moral outrage at his views and threatened to banish him? Or, as the program in Denmark does, would they have approached him on the premise that he aspires to a 鈥済ood life鈥� and simply needs quality relationships and the skills of resiliency to deal with life鈥檚 challenges?

Denmark鈥檚 program relies heavily on private and local initiatives to disengage radicals. Surveillance by government of an individual鈥檚 risk of violence poses its own difficulty. A helping hand or a kind word of warning from a community leader, religious figure, or mental health expert can often turn around someone bent toward destruction in the name of a cause.

Such persons may not end up being 鈥渄e-radicalized鈥� in their ideology. Yet given a supportive and loving community, they could desist from causing harm. They might look elsewhere than violence to achieve meaning, honor, or empowerment.

Reaching such individuals is not that difficult. In a 2014 study of 119 terrorists who acted alone, their grievances and their commitment to an ideology were known to family and friends in nearly two-thirds of the cases. In 59 percent of cases, the offender made public statements prior to his or her violent act, according to the study, which is titled 鈥淏ombing Alone.鈥�

In addition, the profile of would-be terrorists is pretty clear. Half of them changed addresses at least five years prior to their terrorist planning. Of the 40 percent who were unemployed, a quarter had lost their jobs within six months. A third showed elevated levels of stress.

鈥淭hese findings suggest that friends, family, and coworkers can play important roles in efforts that seek to prevent or disrupt lone-actor terrorist plots,鈥� the researchers concluded.

In other words, we are all counterterrorist agents, yet perhaps different in how we would approach people who appear radicalized to the breaking point. Will we present the 鈥済ood life鈥� to those on the fringes? Or push them off the edge?

鈥淥ur greatest strength lies not only in what we do but who we are and the values and freedoms we hold dear,鈥� says Britain鈥檚 Home Secretary Sajid Javid. 鈥淭hat is why everyone has a part to play in confronting terrorism.鈥�

The Danish program, known as the Aarhus model for the town where it is located, happens to be one of the most successful. Yet with the rise of 鈥渓one鈥� terrorists since 2008, other countries have emphasized a 鈥渟oft鈥� approach. The aim is to modify behavior by offering an alternative to hate, one based on the good that binds people. Like the name of the Pittsburgh synagogue, we all are part of the tree of life.