Cannabis leads to shooting people - apparently

So, according to coroner Roger Atkinson The shooting of a man in Lincoln is proof that cannabis is not a harmless drug.

I would want to stress… that cannabis is not a harmless drug and this case demonstrates how devastating its effects can be.

Woah… back up there a second sparky.

So the guy was pissed, shot someone after an ongoing argument, but this demonstrates that cannabis is to blame?

Mr Dickenson was later discovered by police lying on the kitchen floor in his home, where officers said it was clear he was drunk.

… a considerable level of alcohol…

Why is the headline not "Alcohol ‘led to shooting’"?

I need a rant category…