I think the common perception is that it wouldn't be on the shelf if it wasn't safe. However, since most federal agencies set up to protect have been completely neutered, so this is no longer the case.
This is my sense as well. And also that the proliferation of legal cannabis has perhaps legitimized any sort of uncontrolled product that implicitly or suggestively advertises itself as a recreational drug, slick dispensary-style packaging and all.
I'm not seeing any published ages of the patients, but the FDA site makes a bullet point of Shruums' potential appeal to children and teenagers. To the best of my recollection, the United States' last big ersatz drug scare happened with spice roughly 10 years ago -- kids of the current generation aren't going to remember that.