I guess I'd start with most colonial freedom wars.

I might not know your personal background, but I have a hard time imagining you come from a lineage that has experience the cost of one of those.

The list of today's remaining colonies is short enough[0] that it is worth considering whether decolonization was "an idea that reached its time" in the late 20th century ; and given that there are examples of peaceful revolutions (eg India and West Africa) it is worth asking whether more places could have undergone peaceful transitions, and whether the cost in human lives and atrocities born within a decade of war doesn't outweigh the cost of the colonial system dying by itself within the same order of magnitude of time.

But then again, I think you're veering us somewhat off-topic as I'd consider a "colonial freedom war" to be a revolution (the people overthrowing their overlord) which is quite different from the topic at hand here, war between nation-states.

[0]: https://en.wikipedia.org/wiki/United_Nations_list_of_non-sel...