Let's say they seem to be consistently on one side of the Russia - USA disputes, of which Syria has been one of the issues. Just a quick browsing of the articles published in the last few months show that the vast majority of the investigations is focused on various malfeasances of Russia, Syria or Iran.

Bellingcat investigations on Syria predate Russian involvement in Syria.

Bellingcat was founded in July 2014, while Russia has been siding with Assad from the start of the war- vetoing sanctions, providing weapons and preventing an open attack by the US in 2013.

Russia did not enter Syria until 2015. Bellingcat's founder was already publishing on Syrian conflict in 2012.

This narrative is falling apart lately with the Dutch parliament pushing unanimously to investigate the role of Ukrainian forces in the attack, Bellingcat is apparently just a pro-US propaganda tool.

I am not super up to speed on this news, but I had a quick look and my guess as to why you are being downvoted, is without context, it sounds like you are implying Ukraine may have had some role worth investigating in the shooting down of MH17.

That is not the case. It sounds like the consensus is that pro-Russian troops brought a missile over from Russia, and shot down MH17.

What the Dutch parliament is proposing an investigation into, is whether Ukraine should have officially shut down its airspace.

Implying that Ukraine is at fault for shooting down an airliner because they did not shut down the airspace seems like blaming someone for being raped and shot because they didn't lock their front door, which is patently absurd.