I'm in the Insurance Restoration/Reconstruction business and every year I see what real Xmas trees do to homes when they catch fire. I wouldn't bring a live cut tree into my home , ever. The thing is, there are Tree farms and they grow, harvest, and freeze dry these trees and then sell then months after they are harvested. Now they are so dry and dead they won't even except water when watered. This elevates the danger. I'm sure all of you have seen a pine tree burn at a bonfire. Well think of that in your home. Even if you were standing there with a fire exstinguiser, you wouldn't be able to put it out. I've seen the devistation live trees have done, and it just isn't worth the risk from my point of view.
Regards