One of the major premises of most religions is to accept that some must be destroyed in order for others to obtain everlasting life. Of course, there are many platitudes that a person relies on to soothe the conscience and sanitize the mind.
The ones to be destroyed deserve it. They refuse to do something, worship God, beg for forgiveness, live a clean life, whatever.They are selfish and nobody can change them but themselves.
But underneath the smug acceptance of salvation, while the others suffer destruction is probably the most selfish concept of all. I don't know how many times I've heard people say, "I don't know why God chose me and not so and so." Is that not an arrogant attitude to have? When fully developed, a person will walk over the dead bodies of friends, parents, children and even their lifetime mate to get to their heaven, paradise, nirvana, etc.
This is a sickness that mankind must abandon before any real progress can be made in bettering human relationships, making the survival of this world possible.