Mafia 20. Radioactive Dreams.

Hey! Do I need to explain it to you like you're a child?
The Smokers attacked Arandor – that's been dealt with.
And it benefits all the maniacs and both mafia groups to frame one of the players using evidence from this event.
Right now, Mold is finding the evidence.
Phenix3 immediately names Cylinder as the culprit. Why?
It seems to me that he just "forgot" something.

Because a car with exhaust fumes attacked Arandor – meaning, the Smokers.

Even this explanation. That is, he literally says that it would be disadvantageous for a Smoker to provide evidence against a comrade (himself).
It sounds extremely stupid, but that's how it looks.