because they damn people to hell with their teachings.
But there is only one who can send us to hell.
Matthew 10
28 And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.
This is nonsense. The LDS is polytheistic, and teaching that the Father, Son and Holy Spirit are three different gods, and that they also will become a god through following LDS commandments and rituals. And this is only the beginning.
Every Church does not possess problems like this.
But there are MANY who can send us down the WRONG path to Heaven.