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I dont know how uk reasoned but here (sweden) they never argued that mask wont help if everything else the same. It was / is the worry that ppl that are not used to mask cant handle them properly and also could feel safe and take bigger risks (less social distancing) because of the masks.
Dont think that was a concearn in societies that are used to implementing masks lika china and south korea (i presume).
Ive been home with covid for 5 weeks today ;/ turns out i likely got it from my lbs mechanic.
Here’s an interview with a, if not the, leading infectious disease expert in South Korea. The whole video is worthwhile, but go to 17:40 if you want the exact moment. Also note his statement of ‘During the SARS and MERS outbreaks, masks were proven to work.’
https://m.youtube.com/watch?v=gAk7aX5hksU
If this isn’t your field, then you could be excused for not being aware of the above interview, published 27 March 2020. The people calling the shots in government have no excuse, it’s literally their job to have found this information out, if one believes that they did not already know.