https://www.icrc.org/en/law-and-policy/geneva-conventions-an...
If ‘no bomb/missile ever is a war crime’, then .. there is no such thing as “terrorism”, either. (Although the argument could be made that there is no such thing as ‘terrorism’ at all, and that indeed, the word terrorism is merely a propaganda crutch used to justify atrocities against so-called ‘lesser cultures’ deemed inferior by the same institutions which used to use the ‘n-word’ to justify their atrocities in decades past, too, before that became difficult to do ..)
You can indeed commit war crimes with sticks too, though, incidentally.
I'll start to believe this sort of fantasy when the people who win wars begin investigating and prosecuting themselves for the crimes that they committed or suborned.