"I screwed up." ~Barack Obama, 2009
"Mistakes were made." ~Ronald Reagan, 1987
"As has become customary in public life, taking responsibility is without consequence, as was the case with Reno. It’s a phrase that means nothing more than: “Get this story off the front pages and move on to something that’s either more favorable, or less harmful, to my image.”" ~Jim Wooten, 2009
I suppose we could argue one party or the other's predilection for taking or not taking responsibility. I suppose.
But I doubt we can debate the difference between the active and passive voice.