Welcome to OpenStreetMap.

While I understand and sympathise with your reasoning, the problem with just deleting an object like this is that people will see it on aerial imagery and re-add.

I'm not sure what other tags should be added to capture the hazards present and so that data consumers are aware of them, but you could try asking at https://community.openstreetmap.org/

If the path is actually fenced off, then you could map the fence as a barrier=fence line and add access=no to any sections of path behind the fence.

Please also see https://wiki.openstreetmap.org/wiki/Why_can%27t_I_delete_this_trail%3F