If you were in the south, you would be lauded as a hero for doing what needed to be done. You would be in the local paper, everyone you knew would offer to buy your supper for weeks to come, and drinks would be free for some time. The people that you didn't know would want to be your friend and the local paper would do a 3 page layout on you in the Special Interest section.
If you were in the North-East, you would be jailed, denied bail, and you would have to sell everything you owned to pay a lawyer who would demand half payment up front. Your children would be shunned in school, your wife would become a social outcast, and the local news station would slam you for having the audacity to defend yourself instead of calling the cops.Your assets would be seized and given to the family of the dead shooter, after your property was searched for weapons which would be seized and eventually melted.
If you were in the west, people in bars everywhere would raise a glass and salute the fine display of heroism...unless it was in California, where you would be immediately jailed.The news media in Ca. would have your picture pasted on every station, and mention that you owned an assault pistol and that you belonged to subversive groups such as the NRA and the local gun club. The Governater would make a statement about the radical actions taken and mention that the bad guy really was a good guy that was just misunderstood.
Everywhere else in the West, the weapon used would be discussed, as well as the caliber and the actual scenario would be talked about for years to come. Some of the local Pistol Academies would set up the actual scenario complete with furniture and start training their students for encounters just like that one so that in the event that it ever happened again, they would be prepared.
In the North-West, you might be OK as long as you weren't in the yuppiefied big cities. If you were, your actions would be scrutinized by soccer moms everywhere and rallys would be organized to show support for removing guns from private ownership. The whole case would be discussed over latte at the local Starbucks and your actions would be condemned for taking the life of another. The shooter would be hailed as a man that was failed by society, and every Psychologist around would be analyzing what went wrong in the shooters life, placing the blame on his childhood, failed school policies and the fact that he was diagnosed with ADD early on.
In the Mid-West, it would be a very local thing. In one county you might be OK in the next county people would discuss the possibility of dragging you behind a truck on a gravel road because of your actions.Of course, if you were in Illinois, the Governor would have his special SWAT Team raid your house, remove your guns, stomp on your Gun-Owners I.D., call the Bomb Squad to remove what ammo you have and make a public spectacle complete with news coverage when they destroyed your ammo by blowing it in the blast barrel.
It really does depend on where you live.