That said, Organizations with professionals should be able to do nuance, at least a bit of it.
But the general public at large ... you're dealing with 'lowest common denominator' which is 'issues with literacy' and harder to grasp - very limited, care, attention span, and may not even be listening to the message - and may be getting misinformation from elsewhere.
Communicating clearly is a skill.
A lot of marketing people I believe have missed the message on this, every day I come across a new product and can't really understand what it does, the value proposition, who it's for, etc.. while at the same time there's tons of arbitrary marketing verbiage. Words matter.
The rules for Public Communications are the same as they are for branding: Consistency, Clarity, Authenticity. A simple, legitimate message, repeated consistently. "Keep Calm and Move On". "Get Vaccinated". "Wear a Mask". etc..