Just remember this video.
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Out of this system, Americans get drugs, and a large amount of valuable business selling weapons, meanwhile the majority of the violence and instability is concentrated in Mexico. As a side effect of this, countless Mexicans sneak into the US and provide us with dirt cheap labor (which has been shown to do more to BOOST our economy than hurt anything, despite what idiots will tell you). We Americans are getting a fantastic deal here, and we shouldn't do anything to try to end it.