Master Blaster, not an anti, not by a long shot. I am just merely pointing out a blatant lack of situational awareness.
As for protecting one's home, home insurance is a fine thing. It isn't as if the bad guys are actually stealing your home, just a few items inside. Why fight for things of such limited value that would be covered by insurance? The bad guys will be leaving soon enough anyway, so the situation is temporary.
The best defense is to simply not be there. While I do not suggest that you don't have a right to defend your things, but in doing so in the situation described means putting yourself in additional danger for meager items.
As for your scenario where the BAR opens up on you, maybe, maybe not. While the burglars may not be the brightest guys, if they do have a lookout covering their situation, he is unlikely to open up on you if you have not already shot. The reason why is that gunshots will bring attention to the situation and an immediacy that would otherwise not be present.
IN the scenario, you are in the doorway and the guy you know who has the shotgun (the only known gun of the bad guys) has it by his side. He is not ready to shoot any direction, much less at you. You have the opportunity at that moment to immediately be out of view simply by sidestepping from the doorway on the outside. If you have a brink house, that means you have not only gained concealment, but also cover. In other words, you could be out of sight long before either had a chance to shoot you. In just a few seconds, you would be completely removed from that situation. One of the best ways to survive a fight is to not even be at the fight. This could be achieved very quickly.
Now, had the situation been different, say where you were inside the house before you realized intruders were present, you obviously would not be able to extact yourself from the situation with any such ease as in the original stated scenario. Without being able to gain distance and cover nearly as well as in the original situation, the context of being in the same room with the bad guys means that you in definite peril. Without possible quick escape, no doubt then the time is upon you to protect your life. Here, starting the battle is to your benefit because if you don't, they will and your chances won't be great if that happens. You will not have the benefit of increasing your distance to target by any significant amount and likely won't have much in the way of cover. If you get to blast first and score a hit, maybe even neutralizing your first threat, the odds of the immediate fight within the room have just jumped remendously for you from 2:1 to 1:1.
For the original scenario, even with the rights to start blasting being perfectly legal in your particular state (it would be here in Texas as I understand it), why start a fight that will undoubtedly put your life at risk for a few material items when you don't have to do so?
There are other benefits as well if you don't start the fight and egress out of the situation post haste. First, you don't have to deal with the cops endless questioning, potential arrest (at least until they get things sorted out completely), confiscation of your weapon for an indefinite amount of time, the biohazard of the blood spills, occupation by the police of your home for many hours, the expenses of having carpeting, furniture, walls, drapes, etc. professionally cleaned and decontaminated or replaced, etc. All of that is going to cost you a lot of time and expense to get things settled. Maybe insurance will pay for the cleanup and replacement, maybe not as the reason for the blood was actually caused by you. If you do shoot and/or kill people in your home, probably the last thing that may bother you even more than knowing bad guys were snooping around your home is that the cops are going to be all over it, looking through everything to determine exactly what the bad guys were doing and to find out if your story is substantiated. So not only did you lose some privacy to the burglars, but now you have lost privacy to the police and the information may make it into public record.
And to think had you just egressed away, the time the cops would have spent there would have been much less, your insurance company dealings would have been less complicated, and your life would have gotten back to normal much more quickly.
An anti perspective? Nope, I don't think so. Fighting smarter sometimes means not fighting at all and any time you have the option of leaving a potential lethal confrontation situation physically unharmed, you are way ahead of the game.