It doesn't matter. If you detain a trespasser on your property, you simply do not have the right to pistol-whip him.
No illegal scum should have the same standing in our courts if the first friggen act they commit is entering the country illegally.
The Constitution, and the law, protect everyone in America equally. Don't like it? Amend the Constitution.
Looking up the articles on Google, they were found not guilty on the pistol whiping charge as the illegals kept changing their story.