Granted, the illegals aliens were breaking the law.
However, those who would rob them at gunpoint would gladly rob you or me. (Especially since you and I probably have more to take.) Gaining control of the border means taking action against all types of illegal activity, regardless of the identity of the victims.
Not likely. The perps went after the illegals, because they were a unarmed and isolated. Easy targets.
I'm armed and not an easy target. The perps would have avoided me.