What does Buddhism say about intentionally killing dangerous insects and beings? Recently I got into a long debate with some people on Reddit about killing pestilent, poisonous insects. Feel free to read it. There are some interesting scientific findings.

Whatever the word is for people who go over-board with their compassion/ahimsa trip... I think they are doing that, considering it was a poisonous spider (about to give birth to 100 more) I dispatched.

So what does Buddhism say about intentionally killing dangerous (poisonous) and/or pestilent insects?
Specifically dangerous insects in one's personal and community environment.
Surely, the suttas, aimed towards forest-dwellers, must have some guidelines on harmful insects and animals.
This is not justifiable in terms of the precepts. Also any action like killing will be rooted in hatred, hence is counter-productive to achieve the Buddhist goal of Nirvana or peace for one self. Also you have to look at the possible effect on subject of the action. Will the subject be happy about it.