Everything we did was criticized. For about thirty years we lived with the world against us, accusing us of things we didn't do!
I would say colonialism is a wonderful thing. It spread civilization to Africa. Before it they had no written language, no wheel as we know it, no schools, no hospitals, not even normal clothing.
Poor air quality, which can be influenced by a variety of fumes, chemicals and allergens, is arguably the leading cause of triggers for most asthmatics in urban areas.
Declaring independence was the most traumatic decision I had to live up to. Because I didn't want to do it.
The risk from viruses is an unanswered question - and it won't be answered until you have had organs transplanted into humans over many years.