Not sure while everyone suddently pretends it's not acceptable.
I am absolutely not keen to let troops go on the ground. However, these the military options need to be openly discussed without any taboo. Not only it tells Russia If you don't find an agreement with Ukraine, things will escalate, but in a democracy, you need to have parliament and politicians in the discussions, we talk about kids dying for Kyiv. Is it worth-it ? I don't know, which is why we need to have this discussion.
There is no sudden change, not sending troop was the default stance for most people from day 1. And most politicians agreed with it, so there wasn't much need to speak up against it.
But now that Macron isn't ruling it out, voices against it need to speak up.
While i share you criticism for "liberal" (particular in the American sense) warlust in general, we cannot look at the current situation without acknowledging the russian agression. And Putin is most certainly not a liberal.
The spillage of blood is a valid criticism in so far, that the West was reluctant to support Ukraine properly, only tossing lifeline after lifeline, dragging the war out.
The genocides of Capitalist Colonialism in the past 200 years have a far greater death toll than anything "leftists" have done. If you look at King Leopalds actions in the Congo, or Britain's in India, and South Africa....
I mean, Hitler didn't just come up with the idea of having concentration camps. They were already a practice of Western and Colonial powers (first tried by The Spanish on Cuban farmers, the photos of piles of human bones from "The Reconcenstrados" are quite eye opening)... And the practice was almost always done with the enrichment of Capitalist business interests in mind.
Capitalism has always gone hand in glove with the enrichment of the ruling classes at the cost of the lives of the poor, vulnerable, and dispossessed.
Capitalism was the economic model of the Colonialism that came to define the world as we know it today.