Moderators have the same posting rights & responsibilities as everyone else. Moderator's "role" has nothing to do with their opinion, or anyone else's opinion.
"...Is it a moderator's role to advice people not to buy a certain stock?..."
"It is easier to fool someone, than to convince them they have been fooled."
For those that don't get it, it means that people need to be more careful, and do good due diligence...