some earth history taken from startrekI still remember one or two decades ago...
When something like this happened.
The media will broadcast about solidarity between humanity, whatever your race and religion.
But today, it's a blame game.
One or two decades later, there will be riot attacking certain groups, races, or religions.
Decades later, some countries even declare war to their neighbor country for spreading a virus to theirs.
Other decades later again, they even declare war while the pandemic is still going on.
Then suddenly, when things get worse, someone calls for peace and civilized behavior, established a world government.
That is when the world finally being peaceful and everyone is brother and sister.