If you watch enough hog hunting and trapping videos you'll notice its common for one man to trap an entire group of a dozen or more hogs in one night with corral type traps while most hunting videos will show 1-2 animals being taken before the rest of the group scatters. The corral type traps work so well with hogs because once one goes in the rest of the group will naturally follow this "decoy" often resulting in the whole group of various age classes getting trapped. The only effective shooting comes from chasing them with a helicopter or a vehicle at night with night vision, neither of which we'll ever see here.
This is like trying to remove sparrows or pigeons from a barn. You can kill one or two here and there with guns, but you'll never get them all. You'll only encourage some to leave for less dangerous land, thus spreading the problem while educating these animals to avoid humans. However, switch to a live multi catch trap and the first animal in decoys the rest to join him for a meal.