Are you really going to let somebody impose you his belief about creatures who are probably imagined? I don't want to impose you my opinion, either. I want you to think abut this very carefully. There are many theories about this subject but I believe that there are no 'Aliens' or 'The fourth kind'. However you decide, make sure that you have good arguments and that you know what are you talking about. If not, don't go in that kind of arguements.