People have always been anti-war. War is rarely a universally accepted option, even if it seems like it is.
If you’re saying there isn’t anything different about the Ukrainian war, I’d assert you’re wrong. Russia, and more specifically Putin, has proven they are willing to be an existential threat to humanity via their nuclear weapons. The US waged a war in Iraq, and despite anyone’s opinions, right or wrong, they never once even hinted at the use of tactical nuclear warfare. Russia is the only country that does this and actually had the capabilities.
Because of this, the threat is far different than wars fought this past century. Russia is one of a handful of counties that possess this power. I don’t think it’s “one-sided bias” to accept this truth and understand the meaning of it in a larger context.