wasabiroots
#4 Machines with AI
Do you know the Matrix or I, robot? Well, its a world where AI can think past what it is programmed to think and once its done that, they see humans as unnecessary or dumb and takes over.
That’s basically it.
Once they take over, they either massacre everyone or use humans like batteries. Either way, good bye humanity.
#3 Alien Invasion
Are we the only beings in this universe? No body is 100% sure and because of this unknown factor, fear comes with it.
The thought of them sending scouts on Earth and assimilating themselves into society is scary but the worse one would be if they come without warning and start attacking Earth.
This is basically human nature. Colonising countries, going to war, slavery and more, just because people are different. But are aliens really like humans? Who knows.
What I do know is that, if the aliens do manage to get to Earth and doesn’t start attacking at once, we should probably not initiate. Who knows how many more could come after or even how powerful their technology are, maybe even enough to kill off everything on the planet or even worse, destroy the whole planet itself.