Well, I imagine the joke is that if a bunch of Pokemon hunters who had previously only descended into their mother's basements decided to hike 20 miles down from the mountains into a 120 degree radioactive desert and dry lake bed through barbed wire, rattlesnakes, machine gun mounted SUVs and helicopters, it wouldn't turn out so well, so most people aren't taking it too seriously and are having some fun with it.
Taken on top of all that, if you were to get through all the defenses and natural barriers, it's not as if the top secret aircraft (which is all that's there) are just sitting out in plain view for anyone to see in broad daylight. They're inside closed reinforced concrete hangars. So you wouldn't see jack shit anyway.
So go organize a rush on an immigration concentration camp if you feel that strongly about it instead of just being self-righteous about unrelated pranks on the internet. But you're not going to do that because you (understandably) don't want to suffer the legal consequences of such an action as yet, which is why you're just going to pout about jokes.
You know, at the height of World War II fun didn't stop happening. People need humor and distractions from the awfulness of the world sometimes in order to cope and function.