That is your opinion that there would be no net effect with respect to the terrorist threat. It is not however the opinion of those who have taken an oath to support and defend the Constitution of the United States as it is their duty to defend our borders and stem the tide of criminal aliens entering our nation. When one follows the law of the land there are few opinions that matter and yours is not one of them.
Let me ask you something? Do you think the border guards stand to gain if we make their job perceptually more important be indicating that they are protecting us from terrorism instead of rounding up shoeless peasants? The rest of what you said has nothing to do with terrorism and is irrelevant to this conversation. What is it about you border fanatics that you are unable to stay on topic. Oh that's right: No concrete evidence supporting your opinion.