Armed man walking around outside of MMP last Wednesday right after the game?

So a buddy and myself were leaving the stadium last Wednesday when we saw a “protester” armed with an assault rifle, a gravy seals vest, and a anti-Biden flag walking right through the crowds leaving the stadium. I haven’t been to many games lately so just wondering if this is normal and how this was okay? Lots of people, I’m sure regardless of their political stances, had worried and confused looks on their faces. I mean I really don’t get the end goal here, what does this have to do with baseball?