Claims provide this false sense of security in their own magical ways. Instead, they should require people to actually guard their stuff, i.e. leaving the claim area should disable it.
*Personal* claims should be no larger than a house with a few containers. Pop your house and stay inside to "defend" it.
For anything else there's the Village. Shared claims should not exist so that you don't just spam them.
Makes more sense both technically and practically.