I actually do feel bad for them. I generally feel bad for the various extras in movies and TV shows that get killed (though it does depend on the movie/show). Somehow it can get me worse than when a named character dies.
That's also why I really don't like "everybody laughs" endings for episodes where people died.
And why I had to give up reading X-Men comics after decimation. With that many characters dead, especially children, I just couldn't continue with the narrative, especially since the deaths were eventually pretty much forgotten in-universe (which, yeah makes sense, you can't constantly have the characters grieve, but still)