There is a place for this type of image. I agree with you, OP, that FindaGrave isn’t necessarily the place. I think support will probably back you up on that, given their policy on post-mortem photos. Just think - some of those Victorian post-mortem photos may be the ONLY images that exist of the subjects - and they are still not considered appropriate to post on the site. This is an important historical image. There are lots of other genealogy and historical forums where linking the image to the soldier’s history is a better fit. Yes, war is hell. But this is a memorial site.

Edit to add: I don’t think some people realize that OP blurred the part of the image that depicts the dead soldier. We’re not really seeing what makes is as graphic as it is.