Possibly controversial opinion, but experiencing and processing fear, loss, sorrow, and other difficult feelings is a vital part of growing up. Obviously we should be doing everything in our power to prevent kids from experiencing actual trauma, but introducing them to things which are inherently safe but might take some time to process and reconcile (such as a kid’s/family movie with some challenging scenes) is a good thing, of course within reason and while being respectful of their autonomy and consent