The article seems to have been edited, previously it ended with "It makes me want to not keep living" or something to that effect, instead of the quote from Ecclesiastes.
Another way to think of it is: I don't like Donald Trump. I think what he does is wrong and bad, and it saddens and angers me if I let it. But, if I hold true to my beliefs, then he's just another part of the universe playing itself out, which will continue inexorably regardless of how I feel about it, so there's no sense in getting mad about it.