Why are we so reluctant to focus on fairness and respect of the people?

In 2 days I will give a speech at Spotlight Hotel Investment Poland & CEE in Warsaw about the topic of my passion and book "Put your people first and the rest will follow". 
I am sitting in the hotel room and reviewing what I am going to talk about. I have the slides ready and I am working on the introduction:
                                                                         Why focus on happiness?
I have been working with this topic for 5 years now, and I have become so absorbed by it that I have almost forgotten why  not everyone focus on this?
Am I close to the truth if I say it's because of FEAR?

• fear of losing control
• fear of not being the best
• fear of others making better decisions
• fear of not being needed

or am I wrong?
Could it be something else that drives senior leaders away from focusing on happiness of their people. 
Could it be ignorance? Could it be that leaders still today do not know/ be aware of the amazing impact happiness has on productivity, creativity, trust, loyalty and most importantly the health of the people.
I refuse to believe that any senior leader want to be a tyrant towards their people. So why are so many of us still behaving in this way?
Weekly I am reading about people who are leaving their jobs because of "bullying bosses".
I got a few of my slides for my presentation from a friend and passionate believer in Happiness at work Michal Srajer and one slide in particular is very powerful. The rocks of separation between: 
what we know                                                                                                                               what we do

Science have been telling us for at least the last 30 years that you get better results from people if you treat them fairly, respectfully, give trust and autonomy. Then your people will reward you with loyalty and dedication and all the other benefits that comes with happy people.
If no other argument will convince a leader to be do what is right - the customer/guests and clients will like your people more if they are happy. 
A happy person makes me happy and makes me stay longer - ie buy more...would that convince you?
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