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I didn't want to go down that road anymore as it's a waste of time. But since you asked, just google "hku mask research". Various experts here spoke on radio back in March about how their peers in western countries argued/questioned the use/effectiveness of masks just because there was no randomized, double-blind placebo-controlled study that proved it was effective. What happened to the saying "better safe than sorry?"
I have zero argument with better safe than sorry as an argument for masks and that is one of the reason their politicization dismay me. I just have a problem with people who then go out of their way to make it seem like not wearing one is like being a murderer. And the mechanismsfor the positive aspects of mask usage is clear. But some people don't wear the right masks or use them properly - the viruses and aerosols are small enough to get outside mask that doesn't fit tightly enough, though arguably at a lower dose which might reduce spread. It can also lead to people compromising on their social distancing requirements out of a false sense of safety. But my opinion is similar to yours - I think that they will likely have benefit if they are used properly and there are good guidelines on ensuring people are consistently doing the right thing.