slamdunk, it is you who miss the point.
[list=a][*]121.5 is the only frequency on which ATC can triangulate an aircraft's position[*]ATC welcome the practice in use of the service[*]Yes, the Radio and Telcommunications Agency in the UK "owns" the frequency within UK national borders[*]If you're a foreign visitor to our skies, are you likely to be able to assist with a lost PPL if you don't know whether you're near Maidenhead or Maidstone? Dungeness or Dungeon Ghyll?[*]If a genuine emergency occurs, you can cancel a Practice Pan under way[*]All the evidence is that allowing Practice Pan calls on 121.5 aids in safety, rather than endangering it[*]If you are a visitor to our skies, what entitles you to tell us what we permit?[*]Yes, it may sound arrogant, but I have flown in every continent of the world except Antarctica, and in a huge range of countries. And I still maintain that a UK flying qualification is as good as, or better than any other.[/list=a]
If you don't like what goes on on 121.5, yes, you can always turn it off, or just turn it down temporarily. This is unlikely in the extreme to be a contributory cause of any accident.