Because science.
edit: after reading so many thoughtful comments, I am changing my view on this matter. If you are sick, and go out in public, please be kind and don't spread your germs everywhere. If this means wearing a mask for you, then God bless you. If you choose for whatever reason to not wear a mask, then God bless you and you should be free to decide that. If you go out in public, you assume risks that there are germs out there. If you are not comfortable with those risks, you have the right to no go out. If you are a business, you should not be required to put up any signs or enforce any such orders. In fact, there shouldn't even be such orders. In other words, let's just go back to the way things were. This may mean imposing a BAN on requiring masks not a ban on the masks themselves. Thanks all for the lively discussion.
Wearing a mask goes against my conscience and my God given unalienable rights. As well as any logical thinking/common sense to “mandate all” a medical device without knowing medical history of each person that would be medical negligence/malpractice, civil negligence! “They’re” doing everything they can to suppress your own immune system that’s now considered a conspiracy theory to have an immune system. I asked my Dr “come on doc will you be real with me, don’t you think this is a load hogwash, are you getting sick of this”... Well I’m used to it now, and all of us here got our Covid vaccine, he says! But their still wearing that pad on their faces. It’s so sad. People are like robots. None of this makes sense and I’ve worked in the medical field and I’m no Dr this is basic medical 101 and in fact doing the complete opposite, more harm than good. So then it boils down to the social/medical/$/media pressure negligence and malpractice. This is criminal and inhumane and then the psychological part of this, game on the people and And I understand those who need their jobs and have to go along with it in order to provide for their families.