Killing something because it mistakenly wandered into your periphery isn't exactly what I'd call pragmatic.
If our solar system drifts too close to another civilization I don't want to get squashed. That's the maxim. We are the fly. If you don't want something bigger than you to be entirely justified in killing you for no reason, you cannot believe yourself to be entirely justified doing the same.
If our solar system drifts too close to another civilization I don't want to get squashed. That's the maxim. We are the fly. If you don't want something bigger than you to be entirely justified in killing you for no reason, you cannot believe yourself to be entirely justified doing the same.
The golden rule is really hard to beat.