Civilians can be hit in cross-fire. So you need evidence that civilians were targeted. Then, you need evidence of whom targeted them, which may or may not be that simple to find.
At the moment, all pictures and accounts in the media and online are purely emotional because the aim is to provoke emotional reactions, not cool-headed analysis.
I have no horse in this race, propoganda is propoganda.
And the problem is, it's actually not completely outside the realms of possiblity, and I have no way to know. As far as I'm aware, the Ukrainians are fighting the good fight, but that's what I _would_ think. When the propaganda is flying this thick and this fast, maybe I'm as bamboozled as anyone else.
On the other hand shrugging and going "dunno, both sides lol" seems pretty ghoulish when the civilians are being killed and homes and cities bombed to nothing.
[1] I do not know where they got that from but it would have been TV. Trying to figure out where that comes from using only sources I can find leads me to a combination of the (apparently true) report that prisoners with military experience are released if they fight against Russia[2] and a TASS(!) report that Ukraine is responsible for collapsing the corridors[3].
[2] https://www.independent.co.uk/news/world/europe/ukraine-army... amongst others
That's no secret, that's pretty much from official statements of Russian officials.
Al Jazeera reports what both sides are saying.
https://www.aljazeera.com/news/2022/3/7/russian-military-con...
As if the official statements of Russian officials are worth the toilet paper said officials use. Did you miss all the blatant bullshit they said up to and during the invasion? That it's only military exercises, that they're pulling back troops, that they're only on a small special operation, etc. Why would anyone trust them?
That's why confirmation and vetting by orgs like, e.g., Human Rights Watch is so important.