Motives matter too. Bombing of Serbia was to stop a bellicose regime and the humanitarian crisis it was creating. It was like bombing Russia right now, which I'd support fully hearted, if it was a possibility.
In a way, they were implementing a century old policy of a guy named Vaso Cubrilovic who argued that Albanians should be expelled[2] from the lands Serbia (precursor of Yugoslavia) took in 1913.
What NATO did, is stopping exactly this from happening.
[1] https://www.hrw.org/report/2001/10/26/under-orders/war-crime...
[2] https://en.m.wikipedia.org/wiki/The_Expulsion_of_the_Albania...
And as for that supposed policy of Albanian expulsion, by how much did the percentage of Albanians diminish during the Serbian rule of Kosovo? And by how much did the number of Serbs diminish during the Albanian rule of Kosovo?