Grudging acceptance?
James Rummel comments on my post about the purpose and limits of government.

Update: sorry, yes, it was "grudging realization." Anyway, government has to be intrusive to be effective, but there must be limits to the degree of intrusion, to preserve the faith of the governed that the intrusion is justifiable and should be allowed. The difference between party A investigating party B for a possible violation of party C's rights, and a fishing expedition for A to find something about B, possibly with no party C of any kind.

This does work back to an express libertarian principle, that there has to be a wronged party, a victim. It also means that there must be laws and impartial referees to determine when intrustion is justified, and penalties when the intrusion is not justified but happens anyway.