I've heard quite a few people say that the Russian culture and people are violent. I really don't know if this is true, but there seems to be plenty of evidence that the Russian military is perfectly okay with killing innocent civilians.
For example, here's a quote from just
before the invasion of Ukraine:
>>>"The history of Russia's military interventions -- be it in Ukraine or Syria, or its military campaign at home in Chechnya -- is tainted with blatant disregard for international humanitarian law," said
Agnès Callamard, Amnesty International's Secretary General.
"The Russian military repeatedly flouted the laws of war by failing to protect civilians and even attacking them directly. Russian forces have launched indiscriminate attacks, used banned weapons and sometimes apparently deliberately targeted civilians and civilian objects -- a war crime."<<<
https://www.cnn.com/2022/04/04/europe/russia-military-culture-brutality-intl/index.html
I do agree that Russians who don't oppose the war bear some responsibility for it.