If I have written something, and you decide you don't want to see it, then you should be allowed to delete it from your device. Again, no issues there.
However, if I have written something, you don't get to prevent that from being viewed by all parties, and you definitely don't get to delete it from my device. That's censorship, and I have no idea why anyone would use an app which lets third parties delete your data from your device without your consent.