Any time I see someone use the term “fear mongering” sincerely, I add a general heaping of salt to whatever they are saying. It’s often an attempt to turn the topic to the “evil motives” of the “other side” before the original debate is settled.

If there’s nothing to fear, that can be said without accusing anyone who thinks there is something to fear of trying to generate it for selfish reasons. In fact, I’d think that showing someone is fear mongering will be a greater burden than showing any particular thing they say is untrue, let alone a deliberate lie. But it gets thrown around so much lately as if it’s an argument on its own.