Yes, that's the word. Its simplest form is "theto", "I put". We have the word "thesis" derived from it. "Appoint" stratches the meaning away from placing one thing on top of another and toward a directive to do something, and the incorrect grammar parsing delivers that comical image of God saying to heretics, "I appoint you to go to that rock and stumble there". None of it was intended by St. Peter; all he is saying that both the faithful and heretics are on the same rock, -- there is no other.
The next verse is not contrasting in any sense. God calls out of darkness; he does not call into darkness, and he does not appoint to stumble, marry five wives and start a church of England, or invent TULIP theologies.
"God calls out of darkness; he does not call into darkness, and he does not appoint to stumble, marry five wives and start a church of England, or invent TULIP theologies."
Harley, your "stiff neckness" is admirable, but you have arrayed against you the "Balkan Mountain Bandit Brotherhood" of FormerLib, Kosta, Alex and yours truly. You've no more chance against us than a wounded Turk dragging himself from a battlefield under our malevolent gaze! :) Hope you had a nice, if early, Pascha, my friend, though truth be told, if your theology is right, I can't imagine why a Calvinist would celebrate the day.