And yet, it’s hard to see how places like New Zealand can ever feel safe without some changes internationally. “We need to understand American laws because they affect us,” one commentator said on Radio New Zealand this week.

Indeed the lack of legislative effort by American lawmakers on the issues that helped spawn the Christchurch attack — guns, racism and tech platforms — is no longer just a frustration in the United States. Now it wounds the world.

There’s hard work to be done for that to change. The solution is not praying for victims or praising Ms. Ardern on Twitter. What New Zealanders want is for Americans to learn from others, for globalization to go the other way, even if it means limitations on fundamental U.S. of A. freedoms.

On guns, countries like New Zealand have less to confront: Of the 3.9 million New Zealanders of gun-licensing age, 238,000 — just 6 percent — have a firearm license, according to the website GunPolicy.org. In the United States, three in 10 adults say they own a firearm.

Tech companies are another challenge. Despite a growing body of research showing that the algorithms of YouTube, Facebook and other social media platforms push people further into violent extremism, getting those companies and their employees to dial back their self-regard and shift their priorities may be as hard as persuading gun owners to give up their AR-15s.

And let’s be honest: Those are the easy things to fix compared with racism and white supremacy.

Some Muslims in Christchurch are hoping that the unity of the community and New Zealand officials will set a new standard.

“If we can use what happened here to say enough is enough, if we can promote what we call in New Zealand ‘aroha,’” said Mustafa Farouk, president of the Federation of Islamic Associations of New Zealand, using the Maori word for love, “maybe the people behind these shootings will change.”