Theres no way of knowing either way.
Like Abaddon wrote all we have is our perceptions and pooling them together to construct a reality/existence. Now you can side with the notion that there is an actual objective reality and we're always approaching a better and clearer understanding of it by our prodding, questioning and experimenting...or you can say its all one mega dream or thought of another being. Neither can adequately answer SHOULD or SHOULDN'T.
Since we're all apparently sentient and can come up with concepts like justice/injustice and good/evil we may have the idea that if the capability is there, its in our hands to decide on what should and shouldn't be allowed to exist in the world. What kind of world are we shaping? Even if its all illusion aren't lucid happy dreams cooler than nightmares? (I've never been able to control my dreams darnnit!)