There is a difference though, and that is that while babies tend to be in the vicinity of adults, that could potentially be terrorists, you cannot make the same assumption (if you were to actually be make it in the former case) about uniformed and distinctly marked UN-peacekeepers that have their own bases. Attacking that letter can not be collateral damage or be an attack on potential terrorists, while the former could with a lot of mental gymnastics be legitimised (though not morally justified).

And let’s be real, international diplomacy is the art of mental gymnastics at olympic level.