"RuleSets": [{
    "name": "default",
    "enabled": true,
    "defaultAllowDamage": false,
    "flags": "HumanNPCDamage, LockedBoxesImmortal, LockedDoorsImmortal, TurretsIgnorePlayers",
    "rules": [
      "anything can hurt dispensers",
      "anything can hurt players",
      "players cannot hurt players",
      "players cannot hurt traps",
      "traps cannot hurt players",
      "players cannot hurt barricades",
      "barricades cannot hurt players",
      "highwalls cannot hurt players",
      "anything can hurt heli",
      "anything can hurt npcs",
      "fire cannot hurt players",
      "anything can hurt resources"
    ]
  }​

this is my rules set

Right below what you pasted is where the answer lays.

notice under entity groups, there is a spot for traps. any trap item listed in this line will be excluded from the rules above and will take damage. You can remove the item name of the trap which should resolve your issue. Bonus - Notice how I have all the fireworks listed out, this way you can launch them off on the server.