OUR GUY LEFT A MANIFESTO!
This is leaked and confirmed by the Polish police forces.
It's called "Supercommunism" but it's based and interesting, recommending you to read.
This is why he killed the people. Read and download quickly before THEY delete it.
Text format:
https://pastebin.ai/p/rul8YKVqpHTML format (with formatting, looks better):
https://file.kiwi/7d4bcd6c#_EGvMvCOH5GYvrkVbqOVDw