In Texas if someone breaks into your home, or they are on your property after 9pm (though i heard they just recently changed it to sundown) and you shoot and kill them, there are more or less no consqeunces.
Deadly Force in Defense of Person
"A person is justified in using deadly force against another if he would be justified in using force under Section 9.31 of the statute when and to the degree he reasonable believes that deadly force is immediately necessary to protect himself against the other's use or attempted use of unlawful deadly force, if a reasonable person in the same situation would have not retreated. The use of deadly force is also justified to prevent the other's imminent commission of aggravated kidnapping, murder, rape or robbery."
and:
Deadly Force to Protect Property
"A person is justified in using deadly force against another to protect his property to the degree he reasonably believes the force is immediately necessary to prevent the other's imminent commission of arson, burglary, robbery, theft during the nighttime or criminal mischief during the nighttime, and he reasonably believes that the property cannot be protected by any other means."
"A person is justified in using deadly force against another to pervent the other who is fleeing after committing burglary, robbery, or theft during the nighttime, from escaping with the property and he reasonable believes that the property cannot be recovered by any other means; or, the use of force other than deadly force to protect or recover the property would expose him or another to a substantial risk of death or serious bodily injury. (Nighttime is defined as the period 30 minutes after sunset until 30 minutes before sunrise.)"
and both of those fall under:
Reasonable Belief
"It is not necessary that there should be actual danger, as a person has the right to defend his life and person from apparent danger as fully and to the same extent as he would have were the danger real, as it reasonably appeared to him from his standpoint at the time."
"In fact, Sec 9.31(a) [of the Penal Code] expressly provides that a person is justified in using deadly force against another when and to the degree he reasonably believes the force is immediately necessary."