So basically you're saying you're a total a-hole.
What does it cost you to let them turn? 1 second? maybe 2 seconds?
You b'davka don't let them turn when they have a lot to gain and you have almost nothing to lose?
Its dangerous to jump ahead like that. I'm trying to teach people safe driving habits.
Same reason I won't cross the street if a car stops for me when I'm not in a crosswalk. Its dangerous because the cars behind them don't expect it, and because cars coming the other way or in the other lane the same way may not see the pedestrian.