Nato agression, bombing campaing, humanitarian intervetion, as they claimed (still do actually).
Why it happend what, the Nato Agression or murder of child.
With due respect i won't discuss about Agression causes.
There is nothing to explain about little Milica (child from the picture), stray shrapnel, she was in her house on her potty. Does it really matter at all. It's a symbol not the whole point.
Actually NATO is not united like that at all atm. Like in Iraq, Afghanistan, Syria etc. the ones who stood out stood out, even for wars like the Vietnam war that was the case long ago. So I wouldn't put NATO collectively despite the fact that almost all are probably involved in wars all around the world, it's not really been NATO vs ... often. It will only once a country gets attacked.