Yes, it is the right of the mall ownership to set rules regarding attire and so on.
However, the owners of the mall look like crybabies for making a rule prohibiting t-shirts that call for peace. I mean, what's their f*cking problem? People will be divided about this issue of war with Iraq whether they, the President, or Ashcroft like it, or not.
Again, whatever the case for war, I'm getting a bit spooked by stories like this. People aren't acting like the Americans I'm used to. I hear a FEW good arguments for executing this war from people who have given this some thought, however MOST people who I hear argue for war get into this holier-than-thou mode and almost act like you're not a "real" American if you're not on board. Attitudes like this are what are polarizing the country right now, and are probably a big reason why so many question the war. We've forgotten how to talk to each other, and worst of all, our President is making no effort to really persuade the doubters--he says the same things over and over, and his whole tone is like, "I KNOW and that's that", and you're either with him or against him....
I'm sorry, but when trust is utterly DEMANDED of me by someone (I don't care how far up the leadership totem pole the man is), red flags go up and I actually start thinking the opposite--and I think that's how most people are, really.
Back to topic, if any mall or establishment set down such a rule, I would boycott them, and encourage others to do the same, whether they are on the "war" side of the fence or not. Yes, it's their right to set rules for their establishments, just as it is their right to fart in them--and it's my right to tell them to go f*ck themselves and take my business elsewhere.