"Appeal to the majority" is the basis of democracy and failed minority positions have no choice but to oppose it.
Note: I don't think that all lobbying is unethical or contrary to public opinion. I do think that a good majority of it is untested and inorganic. It's monied interests preserving monied interests.
If achieving policy based on majority opinions was actually the end game of lobbyists, why would they need to exist in the first place? Majority opinions would elect majority abiding politicians who would enact majority policies. Where's the step that necessitates lobbyists?
[1] http://www.sourcewatch.org/index.php?title=Gramm-Leach-Blile...