The risk is drastically reduced dude. If you privately claim a unique role (investigator) to one person, that's a small chance you're caught out. If you publicly claim it, there's virtually no chance you dont get caught out.No, it doesn't. If the other person who claimed that role says you're lying and dies you're dead.
I can think of at least one instance in THIS game where a person privately claimed a role to me and I spent the next 2 days trying to determine if it was BS or not.