Community, family and hard work! The cornerstone of all great societies.
Part of my feeling is these incidents also have a lot to do with the cognitive dissonance of living in a failing society, yet everyone is pretending to a greater or lesser extent that the American Dream is still possible. If a person watches the news every day about how our economy is booming but yet they live under the constant fear of getting laid off or a healthcare-related bankruptcy it begs them to ask what is wrong with themselves, and as that psychological shit stream flows downhill from management to bosses, bosses to employees, employees to kids, and kids to other kids---by the time it reaches the lowest of the low it's so toxic and concentrated that it literally drives people to murderous rampages.
Yes there should be winners and losers and handing out medals to everyone is just silly, but the flip side of that are the cancerous message from the larger society: Poor people are poor because their is something wrong with them, if you work hard enough you can as rich as Gates/Zuck/Bezos, if you are unhappy it's because you don't own enough things, etc. The media works very hard to make us concentrate on individual choices rather than examine the enormous logical gaps and endless broken promises of the system we all signed up for.
Guns, medicaid, teachers, millennials, smarphones... all those issues are meant to distract us from the fact that the world doesn't work like television says it does.