I don't think the "launched the wrong app" is really that uncommon a use case. And after launching the wrong app and already being annoyed, the last thing I want is my phone to say "screw you" and make it harder for me to get to the app I intended.

There's also the use case where you have a related apps on the same screen or in the same folder. If you open a Facebook app, how likely is it that you'll want to check out Twitter next? If you get done checking the NYT headlines, might you want to open CNN or Flipboard next? Sick of Angry Birds so you open up Words With Friends? These scenarios don't seem that unlikely to me, but the "go to screen 1" behavior breaks them.