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Know that you'll probably never do anything productive with it, are more likely to die from an accident or murdered with it during the commission of a crime, than stop one with it. Unless you are current law enforcement or military.
Know that if your mental health declines there is a possibility you will do something horrific with it.
Be ABSOLUTELY certain that if the government comes around confiscating it, you WILL give it up willingly, and so will most other obese loudmouth Americans.