@areyouserious it looks like you just joined iNat, and I’m sorry you came across an image you found disturbing. As others here have said, posting photos of dead animals to iNaturalist is OK, and everyone’s threshold of what they find disturbing varies widely. I think most of us don’t like seeing dead organisms, particularly gory ones or images that show an animal exploited or in pain.
It seems like your main ask is that there be some way to flag an image or observation in the mobile app, correct? If so, that’s definitely functionality we hope to add, but I can’t estimate when that will be, I’m sorry.