Scientists can and do lie. And they also make mistakes. And when their work leaks before going through peer review, gullible people think that any retraction must be some conspiracy to cover up the truth.
Consider the whole vaccines versus autism debacle.
Now we could enter into a semantic "no true scientist" argument, but again, we've got to consider those gullible people, who'll take anything as undeniable truth as long as it comes from an apparent authority and it aligns with their beliefs.
You may now stab me if you wish.