Rhetorical Question of the Day

If strict enforcement of our existing immigration laws and the securing of our southern border could (a) decrease the volume of illegal gun trafficking into Mexico, (b) stem the flow of illegal narcotics coming into this country overland from Mexico, (c) prevent terrorists from smuggling chemical, biological and radiological weapons into the country from Mexico, and (d) slow the spread of infectious diseases and dangerous viruses, keeping American citizens from falling ill, why are our "leaders" in Washington so damn gung-ho about doing just the opposite?