There are two important sides to this and you are only focusing one of them.
One is of course supporting Ukraine, as you point out, but what is also extremely important is not to let Russia get away with their obvious bullshit propaganda.
Russia is working hard on getting rid of the sanctions. One of the main tools used are to try to get people in the West to believe to Russian economy is unaffected.
It is not.
(If it was, Putin wouldn’t fx deal with North Korea like they’ve been doing the last year.)
So if no one was calling out Putin and his useful idiots on fx Facebook or Lemmy, how long do you think the public in the West would support Ukraine?