Our brains evolved (or were designed, if you must) to be judgmental, to assess situations at a glance and classify them as good or bad, dangerous or advantageous — just as you are doing with regard to the first part of this sentence. The ability to do this quickly and form opinions rapidly helped keep our ancestors alive in an uncertain world and assisted them in evaluating the relatively simple issues of their lives and the lives of those around them. They passed these abilities on to us. These inherent skills serve us well in many instances, but we have to be careful. Life is more complicated now.
Do I project my discontent with myself onto others? The sword of criticism cuts both ways.