Or make it so that undry claims can only be bashed if you build a claim on that claim. No claim can dry or expand while the other exists.
This takes resources, the "attacker" then needs to spend to building a claim (so not a naked alt with zero investment just running up and smacking it.) then the land claim has an actual contesting system with an actual process and victor.
Allows players to push people out but removes the griefing/pointless claim bashing.