Because It's easier to control machine for humans … or maybe the opposite :
@tag: AdicT AvoiD Waste Mecanical skynet bot human
<iframe width="560" height="315" src="http://www.youtube.com/embed/pHMHkH_DlHw" frameborder="0" allowfullscreen></iframe>
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/bAdqazixuRY" frameborder="0" gesture="media" allow="encrypted-media" allowfullscreen></iframe>