The joke was about raiding the place because Area 51 is, in popular consciousness, a securely guarded place with unfathomable secrets inside, and thus inaccessible unless a very very large number of people attempted to storm the place with bullet-defying Naruto running. Where do you get that mass of people? Why the internet of course, which is also a terrible place to organize an invasion, which makes it all that more ironic.
It should also be noted that at the gathering no violence broke out, because everyone there was for fun. There wasn't even an instance of someone present mentally unstable or too ideologically fanatic actually trying to make a run for it. By all accounts the partiers and the security forces got along amiably. It was indeed a positive, if eccentric, social event.
This debate is going nowhere because it requires the participants to have a working grasp of both pop culture and humor.
Pretty clear this is going nowhere. Have a good weekend!