Part of the problem with laws is that interpretations sometimes become absurd. The notion of removing political pins in offices is a good idea. The lady in the next cube does not get to place Hillary posters and I do not get to place Rudy slogans. This is a common sense practical solution and good policy.
The problem is most of these policies are subject to local interpretation. The question becomes what is and is not appropriate. The subject of historical political figures is complex the example we were given that it would be a violation to post a picture of Presidents Nixon, Reagan or Carter. Why anyone would want to post a picture of the worst US President and anti-semite is another story.
The problem lies in local interpretation of that rule. While the above Presidents are clearly within the lifetime of many Lincoln is not. There are interpretations of this that do not allow for a picture of Abe Lincoln or Teddy Roosevelt. This is another example of the laws of unintended consequences and over lawyering a matter.
Anything potentially can bother some customers. The man next door has a picture of his cat and there are several dog pictures. Dogs are considered offensive to Islam and maybe they will be banned. Perhaps houseplants offend someone and will be next.
Common sense just doesn't seem to enter into these matters.