&gt;otherwise known as evolution. Design implies some kind of thought process before creation.<p>I apologize profusely for offending you with the word &quot;Design.&quot; I accidentally implied the existence of a god which is a totally off-topic conversation and therefore must commit seppuku.<p>&gt;There are plenty of counterintuitive examples of traits that have been selected by evolution. Dogs seems happy all the time and they have not been made extinct yet.<p>Sure, but for the specific case of humanity it is highly likely that the reason we do not stay happy is due to natural selection.<p>Dogs are a domestic animal and therefore a product of artificial selection. We as benevolent caretakers have have selected the dogs that are happy all the time and euthanized the dogs that are angry all the time. The evolutionary strategy dogs employ is a parasitic strategy and less common than the standard strategy most competitive animals follow. Dogs hijack our paternal and maternal instincts and cause us to give them resources, this caused them to evolve non-standard traits that make them happy all the time and unable to survive in the wild. The evolutionary strategy humans follow is more standard and thus we display more malevolent and competitive traits.