These problems and anxieties stem from a belief that things are unfair. Be it racial biases, economic disparity, or policing offensiveness, many of these complaints boil down to this: In such a "modern" society, shouldn't we be finally past these problems? Why does it look like they're getting worse?*
People contrast the problems they face against the positive strides they see elsewhere, and it foments an us-vs-them mentality, projects a "f- you, got mine" on the positives, and increases outlooks of entitlement.
This is a continually escalating and divisive cultural cancer that's erupting. However, it has little to do with feeling "unneeded" (though obviously in the lost jobs cases that's mixed in), but rather more of people feeling actively antagonized. It's a mess.
(* answer: greater information flow and media that profits from outrage)