Jesus, man. Internationala investigation commission has clearly stated that the Malaysian plane was shot down by separatists (https://en.wikipedia.org/wiki/Malaysia_Airlines_Flight_17#Investigation). But persons like you and Roman stiil deny this. So I am sure that even if somebody would caught red-handed Russian soldiers shooting civilians you still would call this naziprovocation.
I do not know who was the perpetrator in Bucha, and I remember that Ukrainians have long history of fighting for freedom with saws, pitchforks, axes and barbed wire against civilans (https://en.wikipedia.org/wiki/Massacres_of_Poles_in_Volhynia_and_Eastern_Galicia) but decades of russian lie-based propaganda and brave and glorious acts of russian soldiers like this one they make the thesis about Russian perpetration very probable.