We blame others a lot for the negative things that happen to us, but we hardly blame others for the positive things that happen to us. Blame works both ways.
We have evolved to focus on the negative, because in a life or death situation we survive if we see the danger. This has an adverse effect now we have less danger in our lives. We are also fed negativity in the news, and the media generally, because it is what we pay attention to and it increases their number of views.
If we let ourselves only focus on the bad things that people do in our lives we tip out of balance and it wears away at us over the years. There needs to be balance. Blame people for the good they do more than the bad. Rebalance the way you see people and you will feel more blessed and less depressed.
The Fullfilment Project 