[Loquebantur]

This is a category error.

Even if you subscribe to the idea of violence being justified in specific cases, there is no reason in the idea "kill everybody including yourself".

People arguing in favor of doomsday-weapons fail to recognize, the supposedly addressed problem not having a solution in the domain of violence means you have to look elsewhere.

[tekknik]

Humans are built with a solution to violence, along with every other animal on the planet. Actively seeking violence and defending yourself are very different thinks and since this is instinctual, I find it very implausible you can convince all 7 billion of us to not fight each other. This is why you end up with violence as a deterrent.