//ILM, when you're in a car, do you wear a seat belt?//
There is a clear and proven benefit to wearing a seatbelt. Scientific evidence was available before the measure was introduced. There are very few downsides. Very few people doubt that evidence.
Despite claims to the contrary the "emerging evidence" of the benefits of face coverings (especially those used by people untrained in the use of PPE) is thin on the ground. Conversely, the evidence of the risks to those faffing about with face masks, constantly removing and replacing them, putting them in their pockets, leaving them round their chin is widespread. There is simply no comparison.