Yes mate anyone who has scepticism about the safety of cannabis, especially the modern stuff, is a BIG PHARMA SHEEPLE
Cannabis legalisation is of no risk to big pharma, they will just sell it. They have multiple products containing THC and CBD already (CBD is almost definitely fine, THC is the one that is potentially problematic)
There are lots of cases of heavy cannabis users committing really weird fucked up acts of violence. Obviously, correlation isn't causation, and it could be that people who are already mentally ill are more likely to smoke cannabis, But it's something that should be looked into, and nobody really seems to want to look into it.
If you're trying to improve the public perception of drug use, pushing the one that potentially gives you lifelong schizophrenia doesn't seem like the best move. Crack and heroin don't even do that, for example.