Coronavirus danger is posed by the cytokine storm.  Excessive cytokine activity in the brain is strongly correlated with major depression, ptsd and bipolar disorder.  Perhaps their goal is to allow the excess cytokine activity of coronavirus to cross the blood brain barrier and result in a psychological disorder.  The ones listed here have one thing in common.  General apathy towards life and inability to take action.  If I was trying to create a docile and compliant population this would be a good way.