Demonising and idolising are the same thing. It is the transfer of the bad and good inside to an external being or thing. We put the devil outside so, if we kill it, it will take away our own evil nature believing that this act of violence will be an expiation rather than a manifestation of it. We put the hero outside so if he is saved, we'll believe we are elevated too, without risking much or ever confronting our fears.
Both are mechanisms of delegation of power and a manifestation of the lack of ability to see: to see ourselves and to see others and accept responsibility.
We demonise food (only in a time and place where food is not scarce we can call any food "junk"). We demonise sugar, McDonald's, Coca Cola, carbs instead of our habits or our inability to take care of ourselves, learn what truly nourish us, see what's our hunger about and look for help when we need it.
We idolise celebrities, footballers, rock stars, actors, instead of exploring our internal need of being looked at, and giving ourselves attention. Attention is like money somehow. We pay attention, we steal attention. Trolls do something similar to celebrities but from a negative place: they are stealing attention back in an aggressive manner.
We demonise the other, the immigrants that come to steal our jobs and our resources claiming benefits without recognising our own invasive attitudes, history or that we are accepting to play a game, but blaming the rival for the result.
We idolise the rich, believing they feel fulfilled, that they "own themselves", instead of looking at our inner hole and thinking what makes us feel empty and poor. In this chat, it is explained how even people belonging to the top 1% of society keep looking upwards without recognising their own wealth and feeling they do not have enough (or as much as the other).
We demonise dictators, with the need of elevating them to some sort of evil deity level because thinking of them as people would call for the reconsideration of our own obedience or recognition of our own capacity for violence and cruelty.
We idolise cool people, the sort of Steve Jobs, and we buy an Apple product hoping that some of this coolness will be spilled over us without thinking why do we need a white computer to feel good about ourselves.
We demonise people that believe "we are not right", because we fear that the system of beliefs we sustain is what defines us, so if we are not right, then what? We die? Protestants and Catholics (or Unionist and Nationalists) are still separated by a wall in Belfast, Sunnis and Shias are fighting right, centre and left, atheist think that people who believe in God are stupid. Communists and capitalists can equally use the antagonist word as an insult.
Some use and exacerbate these transfer mechanisms to concentrate power and wealth. Idolise me and give me your money. Idolise me and buy the products I endorse. Demonise him and surrender power to me so I can fight him.
When we are not connected with ourselves and our inner feelings, we don't connect with our own power and surrender it to a Idol/Hero to go and fight the devil in our name.
However, sooner or later we'll realise that no one can do any of these things for us.