In Trigger, episode 4 shows:
Most of the people who register to receive guns are victims of social injustice: being humiliated, cheated, exploited, despised, but have no legal tools or spiritual support to fight back.
They are forced into a situation where "they can only endure silently", meaning that society has abandoned them.
👉 At that moment, giving them a gun is like giving them "the last right to demand justice".
But the problem here is:
A gun is not just a real-life weapon, but a metaphor for "absolute power".
Once they use it to shoot their enemies, they immediately relieve injustice, but at the same time they also:
Become criminals immediately.
There is no turning back, because society will see them as murderers, not victims anymore.
The "liberation" by guns is actually a double-edged trap:
Helping them satisfy, but cutting off their future.
Giving them power, but taking away their lives.
I think the director intentionally pushes the audience into this contradiction:
On the one hand, the audience understands and sympathizes with them ("If I were you, I would probably want to shoot you").
But on the other hand, we also see that guns are not a truly fair solution, but only a way to "turn despair into destruction".
👉 In short:
The "ultimate weapon" in the film is a symbol of despair cloaked in power. It helps people take revenge, but at the same time kills both the victim and the perpetrator.