Please wear a mask

Please. Wear a mask when you are outdoors and around others.

Yes, wearing masks helps. Here's why. Maria Godoy, Minnesota Public Radio, June 21, 2020.

More.

Even more: 

• Face masks work. They need to be mandatory.
• Do cloth face masks really work? We tested them in the lab.
• Still Confused About Masks? Here’s the Science Behind How Face Masks Prevent Coronavirus. 
• Face masks don’t even have to work especially well to be effective. 

No, face masks don't lower oxygen intake or put you at risk of carbon dioxide poisoning.

Updated: July 20, 2020.

But what of antifa?

What IS antifa? I don't know much about them, and I suspect you don't either, so maybe start with Wikipeda. Jezebel's Harron Walker has a good and quick take for you as well. See "Area Fascist Still Doesn't Know What Antifa Is." (Jezebel, May 31, 2020.)

Beyond that, a greater understanding of "what is antifa" is too much for me to tackle. Instead, I'm just taking a few notes here based on my concern around the president labeling antifa a terrorist group. I decided to do a bit of googling and reading around the news to try to answer one question for myself: Is "antifa" actually behind all the rioting and looting going on in the US these past days? If so, maybe some level of outrage is warranted. If not, it's fair to question what's actually going on here.

Black Lives Matter

Other people can explain this better than I can, so I'm going to quote and link quite a bit here.

Black Lives Matter. Doesn't "All Lives Matter" mean the same thing / mean a good thing, too?

No. German Lopez from VOX explains  Why you should stop saying “all lives matter,” explained in 9 different ways . (July 11, 2016.)

It’s a common conversation these days: One person says, “Black lives matter.” Then another responds, “No, all lives matter.”

It’s also a complete misunderstanding of what the phrase “black lives matter” means. The person on the receiving end interprets the phrase as “black lives matter more than any other lives.”

But the point of Black Lives Matter isn't to suggest that black lives should be or are more important than all other lives. Instead, it’s simply pointing out that black people's lives are relatively undervalued in the US — and more likely to be ended by police — and the country needs to recognize that inequity to bring an end to it.