Why is the SHAHBAG movement HATED?

I have never been a part of the Shahbag movement but from what I remember, it started with the demands of capital punishment for Kader Mollah and other war criminals.

Were those cases false? Were they not actually war criminals? If anyone has any solid links that proves them as war criminals, please share because I see a lot of people undermining the anti-razakar movement these days.

Alternatively, if they were not actual war-criminals and if we don't have solid proof against them, then we also need to clarify that now that Awami League is gone.

I just want to see some evidence from both sides.