Dak, you make a valid point. However, I would suggest that it isn't limited to the IPMS/USA. The current "I'm Offended" culture that has developed in this country has to be a major factor. Keep in mind that practically anything that exists has the potential to offend anyone, but it has gotten completely out of control. Consider the efforts to make the Washington Redskins football team change their name because 'Redskins" is offensive to one small tribe. Other people are offended by the use of certain words, while others by actual historical events. Look at the complaints that started with objections to the Confederate Battle Flag...actually the Battle Flag of Northern Virginia...and expanded to statues of Confederate heros and schools that were named for men who had virtually no connection to the Confederacy other than fighting for the South.
Political views are now subject to similar bias. Liberal viewpoints are widely publicized, while those of a conservative bent are castigated or banned. I was unable to market an article to a magazine I wrote for because the model in question....a Peterbilt 377 with an American Bald Eagle w/crossed American & Confederate flags on the air dam....was refused because "it might offend someone". If I did that model today as an ebook, I would be forced to apologize for it, accused of being a racist and required to remove the ebook from the marketplace. And if you want to get an idea of just how hypersensitive people are getting...as well as ignorant...I very recently had a magazine article corrected by my editor because "I've never heard of it, so I'm sure no one else has ever heard of it!" What was it? Believe it or not, a Mexican Jumping Bean. Instead, the editor changed Mexican Jumping Bean to simply 'jumping bean", thereby identifying every bean on the planet as a jumping bean!
And if you think all of the above is a recent development, it's just the extreme result. Tony Weddel, a deceased aviation artist and my friend, quit doing heavy combat aviation art back in the late '70s or early '80s because he could no longer sell the art or prints. Why? Because people didn't want to purchase art that depicted violence. Result? He wound up doing pretty paintings of aircraft against storm clouds or toned down combat...unless a client specifically requested heavy combat. That, by the way, leads to your comment about viewing scenes of violence in model dioramas. Incidentally, it's also the reason why I've never created a crucifixion diorama of my own....it would offend virtually everyone who saw it.
I have no idea where this is going to end, but if you build models, dioramas, articles and/or books for a living, it's already having an impact on what you can produce without offending someone. And it doesn't matter if it's a group or a single person.
Dak, in case you're wondering, I'm 76 and I have no more problem viewing real life scenes than you do. I knew a preacher who I offered a copy of my P-38 CD-ROM to, warning him that it had a lot of nose art images containing pinup or semi-nude figures. His response? It's history.
It'll be interesting to see what kinds of responses I get to this little tirade.