Yeah, but wouldn't you agree that each time the government does overstep it's authority there is a backlash and they stop? Society seems to keep the government in check. Things like the MLK scenario are a lot less likely now-a-days. If you're say prodrug legalization, it's very very unlikely you'll be blackmailed for your extramarital affairs by a government official (in fact that seems kinda absurd). Yes bad things happen on a small scale, I wouldn't deny that, but I just don't see it as something slipperyslopping anywhere. There isn't a direct mechanism keeping the government in check other than education (and the values that it fosters) along with citizen outrage. Government's fear of it's citizens seems to have worked everywhere in the 1st world.