That covers a wide range of people. Like BEN says, it depends on their intentions. Catfish who try to scam others are scum of the earth, IMHO. Another heinous reason for catfishing would be to lure someone into meeting you in private on a date or something and then rob them, rape them, kill them, or whatever. Other than that I think catfish aren't totally ethical but they're relatively harmless, save for maybe causing some people huge disappointments.