Imagine if someone said "Hey, let's send them Sailor Moon..."
Oh the riots would be funny to see.
Outlaw Star would be valid because there are aliens in that anime. This has to be the funniest thread I have ever posted in because the user who started it is banned, and the topic is ridiculous.
Robotech probably be an ideal choice. This will be an example of showing aliens not to mess with Earth.
I would send them Mobile Suit Gundam 00. So they can fear our technology and release we must understand one another 
Here, here J-Dizzle!!! Let the aliens fear us with our technology and power.
I would send Trigun it basically would show human harshness and benevolence
I'd say we send them Deadman Wonderland so they know that the people of Earth are not to be trifled with.







lol, what if we showed them Urusei Yatsura. I of course don't mean literally, but as a joke.