I think that there is no question that they exist. The question really is, have they or do they visit Earth and that is more arguable. I believe that they have visited us in the past.
I also believe that they are possibly watching us and will return. Perhaps it will be when we are on the verge of destroying ourselves and they will be our saviors. Perhaps they are just waiting for us to become more responsive to friendly associations instead of preparing to assault any thing that is different.
Check out my Extraterrestrial Investigation hubs, on Part 11 so far :).
My comments may disappoint you ... all depending on how much you 'believe' in Alien Presence on earth ... You Believe ... because, some madcap science fiction movie maker, or writer ... or a Theorist ... instilled this ET idea in your head ... that practically made you go into a sort of hiding ... while he went off to the Bahamas to celebrate, the blockbuster's earned Million$ ... made ... by sponging off gullible folks like you and me... Because, my dear Cutters ... there are no Aliens out there, as you are told ... thus, none on earth ... you can come out of the hiding now ... and start living among your own kind ... All I can say in support of this claim ... without support of those symphonic accompaniments, lights and animations ... camera tricks, is ... Trust me ... for why would I lie to you ... I don't even know you ... but above all that, its not the correct thing, to tell, or show lies, to ones fellow humans! Therefore, the first thing you should do is take off that surgical mask and cap ... and I hope you are not wearing those infernal latex gloves and slippers ... Because, by whats visible of you on your Profile ... you seem to have all the qualities of a jolly good human ... one ... who has been "alienated" ... and thus, joined the ranks of those who have alienated themselves ... from the regular ... fellow humans ...shahidbukhari.hubpages.com.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.