The Scottish Government's decision on curtailing crowds over 500 is nothing to do with the potential risks of the virus spreading.
1) Quote from the BBC online news reporting First Minister's Questions today (Thursday 12th March) in the Scottish Parliament.
During First Minister's Questions on Thursday, Ms Sturgeon said the scientific advice suggested that cancelling mass gatherings
"will not in itself have a significant impact on reducing the spread of the virus".
2) The First Minister's reasoning for the move is, and I quote,
"Mass gatherings require to be policed, they require to have emergency ambulance cover, they require the services of voluntary health services.
At a time when we need to be reducing the pressures on these frontline workers - in order to free them up to focus on the significant challenge that lies ahead - I do think it's inappropriate that we continue as normal."