Can a public business put up a sign expressing their political opinion and obscenity?

Asked by fluthaway1 (20) February 2nd, 2022 from iPhone

This is a throwaway account. I didn’t want to get my original account involve in a potential flamewar since this question will be about a topical matter. Basically, I saw a political symbol put up in front of a public business and away from its entrance when I was shopping at a nearby store. Not on a private property or on someone’s car, but put on an actual public establishment where kids could see it passing by. I’m also not sure if the sign was place there by the business owners themselves or by a random person without the owners’ knowledge. But if this stunt was intended by the owners, can they really do that or should I respond to anything about it at all? I don’t really care about anyone’s personal politics, I’m just a little more concern about its disruptive nature and obscenity.