This was it

The only thing left we had to do before making our world perfect.

Getting rid of all abnormal beings.

We've started with the deformed and disabled of our kind, then we exterminated the ones who play make believe. Those who were smarter then the rest were put into werehouses for work, all we have left are the shape shifters. Those whom have protected our planet for centuries, bit now that we can protect ourselves with machinery, they are no longer useful to us.

Success! The creature was dead, along with the last shape shifter in our planet. Now we were perfect. No one was better or worse then anyone else, therefore we shall live in perfect harmony.

We've gotten rid of all that could destroy us. The shape shifters, the animals, the water that could destroy our electrical components...

And the humans.

Now we are all the same. All that live on this earth or the superior beings of the universe.

Robots.