In wars, enemy propaganda says the kinds of things you are saying, to create despair and powerlessness. Look up operations like Tokyo Rose, for example. It's more powerful than any other weapon - it causes the foe to unilaterally disarm. And, as propagandists intend, here you are repeating it, spreading the disease.
Imagine you are working on a team, and someone keeps saying 'nobody cares', it's probably hopeless, etc. That person is the problem, spreading a communicable disease within the team.
The good people outnumber the bad, by a lot. Goodness is not a new or alien concept, but fundamental to humanity and to every culture. Human rights has been overwhelmingly successful and popular across people and cultures. History shows it overwhelmingly. All that is missing is belief in themselves and a way forward.
Instead of this disease, you could spread what people actually need. Hope, courage, belief in what is right.