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None of that is central to why this is happening. If it was, it would have been more prominent in the past when we also lacked all those things. Mass shooters tend not to be poor. Plenty of poor countries with lower quality of life tend not to have this level of mass shootings.
It's primarily the dual issue of massively easy access to guns (given our gun per capita ratio) combined with an increasing culture of aggressive individualism. Mass shooters tend to be people who were raised in poor environments / in conservative areas and fell into aggro gun culture.
If you check cnn right now the half moon bay shooting isn’t even the main story, it’s scary how normalized this has become. >

Is mass shooting a sport now? Wtf is happening >

We have no mandated healthcare, vacation time, or proper wages. 
People are poor, they often can’t afford a decent diet, and they lack the education to know what a decent diet looks like when they can afford it. 
People are stressed because they can’t get a decent job with real benefits. 
And then everyone acts shocked when societal rules fall by the wayside and people tear each other apart. 
The solutions are really fucking obvious, but the democrats would rather keep pontificating about guns and the republicans would rather keep fundraising on conspiracy theories. 
Nothing is going to change until people have stable lives. Healthcare, mental healthcare, paid time off, living wages, and education.