I know it's not the same issue of course, but this example reminds me of the Quranic telling of the creation of Adam and Eve, in which Allah SWT tells the Angels of the creation of mankind and His desire to put them on Earth. And how the Angels respond by describing all of the destruction mankind will cause, and Allah SWT responds by saying, "I know what you know not." I believe that's Sura 2, verse 30. It's one of my favorite passages to think about when I read the news; just because mankind was going to cause destruction doesn't mean their creation wasn't worthwhile. Just because something bad COULD/WOULD/DOES happen, doesn't mean something good couldn't/wouldn't/doesn't.
Peace Sahar02
Off topic but ... angels are pure and do not sin so repentance and seeking forgiveness is something that we can do and this is loved by God. We are faulty and hence we should be humble and that is loved by Allah(SWT). We are disadvantaged that our natures take us towards evil, but when we strive against those urges (Jihad) ... Allah(SWT) loves that too.
This in addition to what you have said may be some wisdom why Allah(SWT) responded to the angels in that way.