You have a right to defend yourselves against attack. That is not the same thing as sanctioning killing across the board. There are many nuances and complexities that such a confrontation brings about. The karmic penalty for killing an invasive species is minor compared to the suffering that will result if you do not address the problem in an effective fashion. That, too, is a karmic obligation to safeguard your soul and your personal well-being so you can use your life with purpose and effectiveness. It is never a good idea to kill things for the sake of killing, even if you view the organisms involved as expendable and not useful to humans in any way to begin with. But that is a personal narrow view of things. All are a part of Gaia, for better or worse, and there may be consequences for other life forms with the removal of something that is a pest for humans. So there are many fine points, but defending your own personal living space, even through the killing of an invading life form, is a minor issue and has a greater good, inherently. It is always good practice, if killing is necessary to reduce the numbers of the predatory species, to do so in a humane way. So that deserves some careful thought. But again, there are practical limits, cost considerations, and in some cases, limited access to what might be ideal. So every circumstance is different and each person will have to do their best to strike a balance between personal needs and the suffering of other creatures.
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