Nowhere in there did I see where he ordered anyone to shoot anyone. The military cannot do law enforcement as it is against the law. They are there for support of the border patrol only.
That being said, If someone is cornered and being pelted with rocks they do have a right to defend themselves, a rock is considered a deadly weapon when used as such. I don't think women and children are going to be throwing rocks.
I don't see a gun anywhere:
https://www.foxnews.com/us/us-troops-seen-setting-up-barbed-wire-near-mexico-border
But keep twisting your panties.