Just wanted to +1 what Glassman said; trails that get deleted tend to get redrawn soon after. For making sure that the general public doesn't accidentally wander onto difficult routes, it's generally better to add tags to describe the route rather than delete it. sac_scale is a good one (many hiking-specific maps won't display trails above a threshold SAC scale). Another useful tag is trail_visibility (if the route is hard to find). And if the trail isn't officially maintained or operated by the park or forest service, then you can add informal=yes to indicate that it's a social trail.