Homicide — By other person — When justifiable.
Homicide is also justifiable when committed either:
(1) In the lawful defense of the slayer, or his or her husband, wife, parent, child, brother, or sister, or of any other person in his or her presence or company, when there is reasonable ground to apprehend a design on the part of the person slain to commit a felony or to do some great personal injury to the slayer or to any such person, and there is imminent danger of such design being accomplished; or
(2) In the actual resistance of an attempt to commit a felony upon the slayer, in his or her presence, or upon or in a dwelling, or other place of abode, in which he or she is.
You'll have to read my thread in the social lounge about tax law for the rest of it.
I know the IRC better than most lawyers, for sure better than any lawyer on this site. However more people have an adverse reaction to the truth. So watch the 12 hour video and then read the law for yourself. Even the IRS had it in the IRS manual warning agents that if they were following orders that citizens could kill them. "Avoid unnecessary taxpayer reaction." Since IRS agents will attempt to take property without a warrant and they can be (and often are) armed, or they have conspired with a Sheriff's office to help steal your property without a court order the agent is committing a felony upon you, in your presence, etc.
Armed robbery and conspiracy to commit a crime are two felonies. Theft in value exceeding 750 (FRN) "dollars" is also a felony.