As Reddit would say, Always has been.
I think you and I are reaching the same level here. It's obvious people will not care about each other and suffering and evil will prevail.
Best to follow your advice, exercise, sunlight, and computer moderation. The last part is very difficult for me, I grew up with the computer, it has given me everything. But if it distresses my mental health I guess it could be argued it will take everything.
Mankind has always been cruel to one another we just never had 24/7 coverage of it until recently.
I think we just have to take a break.
I was thinking about space travel and I really am grateful we can not make it to other planets and spread our misery. Mankind's suffering will end eventually even if it means waiting for the universe itself to collapse, it will end, which is oddly comforting I think.