[ If they hate humans so much they should just kill themselves.
They think they are the only “real” humans. ]
They think that they are “Evolved Humans” and the rest of us are just a bunch of “Wal-martians from flyover country” that can be disposed of...
To quote from one of the later Dune novels, revolutionaries are all closet bureaucrats; they expect to be in charge when the revolution is over, changing all the little things that annoyed them.