As explained - there ar silly drunks and very aggressive drunks. The chance of this happening here is absolutely non existent and very theoretical. But yes if a very aggressive drunk is forcing his way into my home and not reacting to warnings and I determine him to be a threat to me or my family I totally would shoot him to protect my family - no question. Armed or not - - if he poses a threat the idea is not to be on the same level as him and fight fair ...
If it's just a silly non threatening drunk we can't even see straight and poses no threat obviously not. This situation is not as easy as my fellow Europeans make it out to be - guess it's just easier to flame the US.
I just assumed that's something a normal person would do after reading they also called 911 already. Might be wrong information tho.