First I'd like to see some good scientific proof that masks are effective against Covid-19 spread. We've dropped the science on that and no one seems interested

First I'd like to see some good scientific proof that masks are effective against Covid-19 spread. We've dropped the science on that and no one seems interested in clearly proving that they are effective or ineffective. Instead we're railing each other based on our political views. Experts at NIH CDC and universities have changed their dictates, dropped the ball and finally fallen in line on separate political sides of such issues. I guess Man is, after all, the "political animal" first and foremost.