Overtly unprincipled hacks

In DOJ kill list memo forces many Dems out of the closet as overtly unprincipled hacks, Glenn Greenwald writes,

[W]hen you endorse the application of a radical state power because the specific target happens to be someone you dislike and think deserves it, you're necessarily institutionalizing that power in general. That's why political leaders, when they want to seize extremist powers or abridge core liberties, always choose in the first instance to target the most marginalized figures: because they know many people will acquiesce not because they support that power in theory but because they hate the person targeted. But if you cheer when that power is first invoked based on that mentality - I'm glad Obama assassinated Awlaki without charges because he was a Bad Man! - then you lose the ability to object when the power is used in the future in ways you dislike (or by leaders you distrust), because you've let it become institutionalized.