Source? Me. Witnessing 5,000 times where liberals talked about wars (or didn't). I am the source.
The context is that I have witnessed Liberals never having a bad thing to say about war, unless there's a Republican President. But will back whatever war - when there's a Democrat President.
It's like their standards for whether a war is ok or not - is completely hinged on whether a D or a R is in the White House.
As a recent example:
Biden & Ukraine War - just about every Liberal on X/Twitter had a Ukraine Flag to Support the Ukraine War...even if actual Ukrainian Nazis were receiving the Aid. Then also supported continued funding of the Ukraine for that war.
Trump & Iran War - just about every Liberal on X/Twitter is calling Trump & MAGA Nazis & they are calling for an end to the conflict.