I actually don't think the author provided very good arguments. It was my only real beef with the article: "this might do bad things" gets rounded off to "this is dangerous", even though his sources don't say the bad things will happen. They simply might happen.

The Precautionary Principle is problematic applied to public policy generally, but it's the accepted practice in medicine. You can argue it shouldn't be, but you shouldn't pretend you'd be in the mainstream with that argument.

Nobody can predict the future. Bad things only ever "can" happen until they do - they never "will" happen. The author explains why and how those things are possible.