The problem is, it's easy to find evidence that supports, or doesn't support mask wearing. The data and timeline of the mask mandate looks like masks worked in Texas. However, in Iowa, we've never had a mandate. Deaths rose, then fell, and now have risen to about half of what they were in May. Lockdowns ended for most of the state on May 1st, and the rest of the state May 14th. Deaths continued to fall for about 2 months after lockdowns ended, before starting to rise again slowly.
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I haven't really heard a good explanation for the over 2 month fall in deaths (and hospitalizations) in Iowa, other than a seasonality effect.
Georgia never issued a mask mandate, although I believe Atlanta did in mid to late July. Georgia ended lockdowns at the end of April. Deaths decreased slowly for 2.5 months, despite no lockdowns and no mask mandates. Then deaths increased and appear to (maybe) have leveled off the last couple weeks. Why?
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California has had arguably the most strict, and longest lockdowns, and mask mandates but their trend in deaths looks very similar to Georgia. Why? Deaths leveled off and decreased slightly for about 2 months, then started increasing again in July, despite masks and lockdowns in major cities.
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I was a huge proponent of mask wearing up until recently. Logically, they make sense as they provide a barrier to droplets when you cough, sneeze or even just breath. Even if they are not perfect, it's still something. I still wear one when I'm in indoor public places, because I think it MIGHT help, but I no longer believe that for sure. I think they probably can help a little, but are not the main driver behind deaths decreasing in places. I used to get a little angry when I saw people without masks in the grocery store. I no longer care. For every state or country that you can point to as proof that masks work, I can find an example showing that they don't work.