A Two Part Post

We are all clones of Hitler...

The title whilst not entirely accurate converys the general idea....the fact that it lights up in more search results than "you random citizen are like Hitler." & is also slightly more dramatic is wholly irrelevant. Almost all people have stuff in common in the sense that they are humans and thus have similar evolutionary traits that almost all humans have and also similar brain structures...thus most people think in similar ways. A goth can be motivated to be a goth for the same reason an Emo can be motivated to be an Emo. A valley girl can be a valley girl for similar reasons as the Emo and the goth. People often have similar traits.
We often have much more similar emotions than we may think through a process I believe is called convergent evolution but am not entirely certain. An example of this being spacial recognition and memory which in the universal human brain has the strongest memory capabilities due to evolutionary particulars that stem from a time period known in precise scientific terminology as the caveman era.
The six universal emotions are generally recognized as being happiness, sadness, surprise, fear, disgust and anger. Every culture regardless of cultural influence shows and expresses these in the same way.
Thus you have many similarities in the way you think and the way Hitler thought and similar understandable motivations but you also have similarities in the way you think and the way Green Day or Bruce Wayne thinks. 

Collective unconscious

The unconscious is right about 90% of the time. That's why on tests they always tell you to go with your first instinct. According to Jungs theory of the unconscious there are two types: the personal unconscious & the collective unconscious. The collective unconscious is memories, emotions & experiences of humankind or of individual societies. It has to do with us all having similar emotions & correlating those with similar things. It's like if I where to say "table" then what would be the first thing you think of? A general image of a table with a surface and something holding it up. That would be the collective unconscious. However Frank might think of a round plastic table with one post holding it up like in the diner near his house meanwhile you would think of whatever kind of table you though of... For examples sake let us assume it was a square wooden table held up by four posts. You and Frank both though of general tables but ones made of different materials in different shapes. The difference between your tables is the personal unconscious and can be applied to emotion, instinct & experiences. The reason that great inventions are often invented by three or four people around the world is related greatly to the collective unconscious.