Human intervention was performed during the siting and emplacement. The person who chose the sites for the mines and traps (presumably) made decisions on where to emplace them with an eye towards self-defense, and didn't just randomly scatter them over the landscaping.
Insufficient. The human intervention must occur on the decision to detonate, since some innocent person such as a firefighter may be in the path of the weapon during the legitimate performance of his duties. You may have placed your weapons very safely in your X-Y-Z cartesian coordinate system, but the dimension of t (time) may cause the weapon to be unsafely placed.
Booby traps and land mines are wholely indiscriminate weapons, and cannot fall under the protection of the Second Amendment due to the indiscriminate nature thereof.