You’re missing who’s doing the protesting - Palestinians who are being killed by US backed Israel. They don’t give two shits about Ukraine.
To be similar, you’d need Ukrainians being killed by US backed Russia protesting. And they’d not give two shots about Gaza.
Your mistske, like always, is assuming “the left“ is a singular group. In fact, “the left” is just the tons of little groups who don’t fit under “the right’s” general white Christian umbrella. There are a multitude of different interests on the left, which is how you can have liberals angry At Jews, who also tend to be liberal.