Most of the land in NI is owned by the government whose agents do not officially sanction access to bikes. Hence all the forests, hills, mountains etc, despite the cracker natural trails, are generally ridden illegally.And they do remove/destroy trails from time to time.
The rest of the land is owned privately and very few landowners allow access. Quite a few do turn a blind eye but every now and then get upset for various reasons, and remove the trails/features.
Most bikers in NI hope todays event might encourage/shame our own FS into taking positive steps. But we arent holding our breath, and meanwhile we will continue to make frequent trips to Scotland and enjoy the benefits!