Would you say that Austria-Hungary choosing to outright invade Serbia because the assassin was a Bosnian Serb who
might have had some backing from the government, was reasonable? Or was that a land grab? And when when Russia joins Serbia was it solely an action of obligation or because they thought they might be able to get a piece of Austria-Hungary? And similarly when Germany jumps in seeing they can now shift the balance back towards Austria-Hungary, and so on.
And then this just kept iterating until suddenly everybody's fighting everybody, tens of millions are dying, and absolutely nothing was achieved. Then you get the Treaty of Versailles which desperately tried to justify it all by being excruciatingly punitive on Germany, but of course that ultimately did nothing but essentially guarantee WW2 where tens of millions more would die again, and again for basically nothing, with a good chunk of Europe left in rubble.
In the modern war Russia claimed that their motivation for the war was to prevent Ukraine from joining NATO. Their early movements were largely performative or Hail Marys (like the decapitation strike) and within 48 hours they were engaged in negotiations with Ukraine that involved 0 land concessions, but primarily focused on Ukraine not joining NATO. Ukraine chose to fight, at the urging of the West, and so here we are.