"You are going to play our game, now," say these people who are, in fact, playing a different game - literally, a different version - from the one the rest of us are playing.
But the truth is that most people are playing different versions of SL anyway.
I mean, if I want to build something, chances are I'm going to be constrained by the range of textures that others have chosen to make available. But I can hardly complain that because using Photoshop or other texture art packages is "outside SL", that people shouldn't be allowed to do this to get (effectively) enhanced access to building. And really, modifying the client is just the same, except instead of using Photoshop you're using Visual Studio or GCC.
Even if the .EXE files might be the same, I'm not playing the same SL Starax Statosky played. I'm not playing the same SL Cardie Mahoney plays, or Prokofy Neva, or Anshe Chung or Remamian Takashi or Marine Kelley or KyauBrodieorAbigailHortonorFrontierLindenororororororor.... But that's ok - there's room for all these different games, and which one you end up playing is partly your choice, and partly not.
But this doesn't mean that I support landbotting. Competition might drive innovation, but the question is, where is it driving it? The only place it's driving it is that Joe or Jane Average has to pay more for their land. The idea of a good, healthy capitalist economy is that you earn money by customers the things they want, not by taking them away.