Pull troops from Japan and Korea and throw them on the southern border. Better yet, mine the border. After a few exploding illegals, the message will be clear.

Enter the USA legally, you won't explode.

This of course doesn't really need to be done, a video fiction could be created and publicized. Hell, its done with UFO's all the time and if you watch enough Youtube UFO videos, you would think we are being invaded.

You can't be nice to stupid people the only thing they understand is a bump on the head hurts! They will not recognize compassionate overtures. The skull is too thick. A few compassionate cracks on the head gets the attention.

Pain equal bad. Arm missing, hurts, bad. Hole in abdomen, hurts, bad. This place bad won't come here again.

We could also establish "Darwin" zones. Anybody entering a Darwin zone deserves to perish. [link to www.darwinawards.com]

Wouldn't it be dreamy if we could have a world without borders? Yes but unfortunately some people can't manage themselves let alone a nation.

Its embedded in the cultural mindset. Hey, if you enjoy living in a shack and defecating on your floor, great. You enjoy sex and mindlessly breed yourselves into starvation or single sex civilization, fantastic! You choose to live like that. The bliss of ignorance.

We in the USA don't want to live like you and since you won't assimilate to our standards or even comprehend our standards we prefer borders thank you, we will enforce our right to survive.

Yes, negative reinforcement is a viable behavioral control mechanism. Sometimes you have to use it to prevent lunacy.