Emotions aside, I'm not sure you want to live in a society where those that have sworn to uphold our laws, are not beholden to them and break them themselves without consequences. We are supposed to be the civilized ones, and we don't summarily execute people in the streets or out in the woods. I wholeheartedly agree with interdiction efforts and deportations, but there must be a sense of proportion for "criminal" activity. Breaking a misdemeanor law should not warrant the death penalty.
O.K. Then the U.S. should declare "invasion" to be a felony capital offense...