I think you have it completely backwards. You should not involve yourself in any war that you don’t personally want to fight and maybe die in. You do NOT have to take a side. You can oppose the war, or one or both sides, even vocally, without entangling yourself in the war.

If you choose to become an actor in a war, then you also open yourself up to being attacked. There is only one kind of actor in a war- combatant.

Consider the maintainer who did the “delete all files on servers with Russian IP addresses.” This could be construed as an act of war against Russia. Would Russia be wrong to commit acts of war against this person? If the server performed some life critical task like operating hospital equipment or air traffic control or whatever, this change could have resulted in loss of life (so many mistakes in using JavaScript in such cases but set that aside for a moment). If lives were lost as a result, would Russia be wrong to use lethal force against the maintainer?

Disclaimer (sad that you have to add this these days; it should go without saying): I only use this as an example. I think Putin is a thug and I think that it goes against most westerners’ values, mine included, for nation states to preemptively invade other nation states. I’m not apologizing for or justifying any act by Russia. I have deep sympathy for people in Ukraine who just want to live their lives and not be killed or have their stuff destroyed.