Helping either side will still kill people, and likely kill more people, and likely lengthen the war.
The USA should not involve itself in the affairs of others. Period. It’s just a modern form of colonialism where the UsA views itself as superior and a possessor of all knowledge and goodness and therefore the rest of the globe needs its help. This is not the case.
You should read Leviathan and World Order. When order breaks down, it opens up short term opportunistic destruction instead of correctly resolving the prisoners' dilemnas. See the Azerbaijani assault on Nagorno-Karabakh for what happens when Russia doesn't have the focus to maintain order. The US got a lot of shit for not preventing the Rwandan genocide. But according to you, nonintervention was a good thing.