All humans should vanish to where? How? And How long? What about the innocent ones? At least the kids, aren't they humans too? No point vanishing to anywhere else. Cause we'll still be around each other, that's the sad silly truth. Unless you mean we should all destroy, both evil and innocent)
It will be really hard to explain but being territorial and survival are human instincts that we will not be able to remove in our blood. If you are hurt that humans do human stuff, then this world isn't for you. Life is something we can't assume to be perfect. It is really hard to expect humans to become perfect because we are naturally born to be imperfect. The only option that we have is to stay neutral and become immune to this because, before our era, the old people are worse than what we think is worst.